A=−9x2+3y2−8xy3cap A equals negative the fraction with numerator 9 x squared plus 3 y squared minus 8 x y and denominator 3 end-fraction
?=−9?2+3?2−8??3
Đáp án
x=0x=4y+-11y2−27A9x=4y−-11y2−27A93 lines; Line 1: x equals 0; Line 2: x equals the fraction with numerator 4 y plus the square root of negative 11 y squared minus 27 cap A end-root and denominator 9 end-fraction; Line 3: x equals the fraction with numerator 4 y minus the square root of negative 11 y squared minus 27 cap A end-root and denominator 9 end-fraction end-lines;
?=0?=4?+−11?2−27?√9?=4?−−11?2−27?√9
 
Bước
A⋅(-3xy)=9x3y+3xy3−8x2y2cap A center dot open paren negative 3 x y close paren equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
?⋅(−3??)=9?3?+3??3−8?2?2
 
A⋅(-3xy)=9x3y+3xy3−8x2y2cap A center dot open paren negative 3 x modified y with boxed outline close paren equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
?⋅−3??=9?3?+3??3−8?2?2
Dùng tính giao hoán để sắp xếp lại các số hạng
A⋅(-3yx)=9x3y+3xy3−8x2y2cap A center dot open paren negative 3 modified y with boxed outline x close paren equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
?⋅−3??=9?3?+3??3−8?2?2
Bước
A⋅(-3yx)=9x3y+3xy3−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
?⋅(−3??)=9?3?+3??3−8?2?2
 
A⋅(-3yx)=9x3y+3xy3−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 x cubed modified y with boxed outline plus 3 x y cubed minus 8 x squared y squared
?⋅(−3??)=9?3?+3??3−8?2?2
Dùng tính giao hoán để sắp xếp lại các số hạng
A⋅(-3yx)=9yx3+3xy3−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 modified y with boxed outline x cubed plus 3 x y cubed minus 8 x squared y squared
?⋅(−3??)=9??3+3??3−8?2?2
Bước
A⋅(-3yx)=9yx3+3xy3−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 y x cubed plus 3 x y cubed minus 8 x squared y squared
?⋅(−3??)=9??3+3??3−8?2?2
 
A⋅(-3yx)=9yx3+3xy3−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 y x cubed plus 3 x modified y cubed with boxed outline minus 8 x squared y squared
?⋅(−3??)=9??3+3??3−8?2?2
Dùng tính giao hoán để sắp xếp lại các số hạng
A⋅(-3yx)=9yx3+3y3x−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 y x cubed plus 3 modified y cubed with boxed outline x minus 8 x squared y squared
?⋅(−3??)=9??3+3?3?−8?2?2
Bước
A⋅(-3yx)=9yx3+3y3x−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 y x cubed plus 3 y cubed x minus 8 x squared y squared
?⋅(−3??)=9??3+3?3?−8?2?2
 
A⋅(-3yx)=9yx3+3y3x−8x2y2cap A center dot open paren negative 3 y x close paren equals 9 y x cubed plus 3 y cubed x minus 8 x squared modified y squared with boxed outline
?⋅(−3??)=9??3+3?3?−8?2?2
Dùng tính giao hoán để sắp xếp lại các số hạng
A⋅(-3yx)=9yx3+3y3x−8y2x2cap A center dot open paren negative 3 y x close paren equals 9 y x cubed plus 3 y cubed x minus 8 modified y squared with boxed outline x squared
?⋅(−3??)=9??3+3?3?−8?2?2
Bước
A⋅(-3yx)=9yx3+3y3x−8y2x2cap A center dot open paren negative 3 y x close paren equals 9 y x cubed plus 3 y cubed x minus 8 y squared x squared
?⋅(−3??)=9??3+3?3?−8?2?2
 
A⋅(-3yx)=9yx3+3y3x−8y2x2cap A center dot open paren modified negative 3 with boxed outline y x close paren equals 9 y x cubed plus 3 y cubed x minus 8 y squared x squared
?⋅−3??=9??3+3?3?−8?2?2
Nhân một số dương với một số âm sẽ cho ta một số âm: (+)⋅(-)=(-)open paren + close paren center dot open paren - close paren equals open paren - close paren
(+)⋅(-)=(-)
−A⋅3yx=9yx3+3y3x−8y2x2modified negative cap A with boxed outline center dot 3 y x equals 9 y x cubed plus 3 y cubed x minus 8 y squared x squared
−?⋅3??=9??3+3?3?−8?2?2
Bước
−A⋅3yx=9yx3+3y3x−8y2x2negative cap A center dot 3 y x equals 9 y x cubed plus 3 y cubed x minus 8 y squared x squared
−?⋅3??=9??3+3?3?−8?2?2
 
−A⋅3yx=9yx3+3y3x−8y2x2modified negative cap A center dot 3 with boxed outline y x equals 9 y x cubed plus 3 y cubed x minus 8 y squared x squared
−?⋅3??=9??3+3?3?−8?2?2
Dùng tính giao hoán để sắp xếp lại các số hạng
-3Ayx=9yx3+3y3x−8y2x2modified negative 3 cap A with boxed outline y x equals 9 y x cubed plus 3 y cubed x minus 8 y squared x squared
−3???=9??3+3?3?−8?2?2
Bước
-3Ayx=9yx3+3y3x−8y2x2negative 3 cap A y x equals 9 y x cubed plus 3 y cubed x minus 8 y squared x squared
−3???=9??3+3?3?−8?2?2
 
-3Ayx=9yx3+3y3x−8y2x2negative 3 cap A y x equals modified 9 y x cubed plus 3 y cubed x minus 8 y squared x squared with boxed outline
−3???=9??3+3?3?−8?2?2
Chuyển biểu thức bên phải sang bên trái và đổi dấu
-3Ayx−9yx3−3y3x+8y2x2=0modified negative 3 cap A y x minus 9 y x cubed minus 3 y cubed x plus 8 y squared x squared with boxed outline equals modified 0 with boxed outline
−3???−9??3−3?3?+8?2?2=0
Bước
-3Ayx−9yx3−3y3x+8y2x2=0negative 3 cap A y x minus 9 y x cubed minus 3 y cubed x plus 8 y squared x squared equals 0
−3???−9??3−3?3?+8?2?2=0
 
-3Ayx−9yx3−3y3x+8y2x2=0modified negative 3 cap A y x minus 9 y x cubed minus 3 y cubed x plus 8 y squared x squared with boxed outline equals 0
−3???−9??3−3?3?+8?2?2=0
Rút −yxnegative y x
−??
ra làm thừa số chung
−yx⋅(3A+9x2+3y2−8yx)=0modified negative y x center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 y x close paren with boxed outline equals 0
−??⋅3?+9?2+3?2−8??=0
Bước
−yx⋅(3A+9x2+3y2−8yx)=0negative y x center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 y x close paren equals 0
−??⋅3?+9?2+3?2−8??=0
 
−yx⋅(3A+9x2+3y2−8yx)=0modified negative y x with boxed outline center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 y x close paren equals 0
−??⋅3?+9?2+3?2−8??=0
Chia hai vế của phương trình cho −ynegative y
−?
x⋅(3A+9x2+3y2−8yx)=0modified x with boxed outline center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 y x close paren equals 0
?⋅3?+9?2+3?2−8??=0
Bước
x⋅(3A+9x2+3y2−8yx)=0x center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 y x close paren equals 0
?⋅3?+9?2+3?2−8??=0
 
x⋅(3A+9x2+3y2−8yx)=0modified x center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 y x close paren equals 0 with boxed outline
?⋅3?+9?2+3?2−8??=0
Khi tích của hai hạng tử bằng 00
0
, thì ít nhất một trong hai hạng tử đó phải bằng 00
0
 
Bước
x=03A+9x2+3y2−8yx=02 lines; Line 1: x equals 0; Line 2: 3 cap A plus 9 x squared plus 3 y squared minus 8 y x equals 0 end-lines;
?=03?+9?2+3?2−8??=0
 
x=03A+9x2+3y2−8yx=02 lines; Line 1: x equals 0; Line 2: modified 3 cap A plus 9 x squared plus 3 y squared minus 8 y x equals 0 with boxed outline end-lines;
?=03?+9?2+3?2−8??=0
Giải phương trình xx
?
x=0x=4y+-11y2−27A9x=4y−-11y2−27A93 lines; Line 1: x equals 0; Line 2: modified x equals the fraction with numerator 4 y plus the square root of negative 11 y squared minus 27 cap A end-root and denominator 9 end-fraction with boxed outline; Line 3: modified x equals the fraction with numerator 4 y minus the square root of negative 11 y squared minus 27 cap A end-root and denominator 9 end-fraction with boxed outline end-lines;
?=0?=4?+−11?2−27?√9?=4?−−11?2−27?√9
Đáp án
x=0x=4y+-11y2−27A9x=4y−-11y2−27A93 lines; Line 1: x equals 0; Line 2: x equals the fraction with numerator 4 y plus the square root of negative 11 y squared minus 27 cap A end-root and denominator 9 end-fraction; Line 3: x equals the fraction with numerator 4 y minus the square root of negative 11 y squared minus 27 cap A end-root and denominator 9 end-fraction end-lines;
?=0?=4?+−11?2−27?√9?=4?−−11?2−27?√9
Đáp án
y=0y=4x+-11x2−9A3y=4x−-11x2−9A33 lines; Line 1: y equals 0; Line 2: y equals the fraction with numerator 4 x plus the square root of negative 11 x squared minus 9 cap A end-root and denominator 3 end-fraction; Line 3: y equals the fraction with numerator 4 x minus the square root of negative 11 x squared minus 9 cap A end-root and denominator 3 end-fraction end-lines;
?=0?=4?+−11?2−9?√3?=4?−−11?2−9?√3
 
Bước
A⋅(-3xy)=9x3y+3xy3−8x2y2cap A center dot open paren negative 3 x y close paren equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
?⋅(−3??)=9?3?+3??3−8?2?2
 
A⋅(-3xy)=9x3y+3xy3−8x2y2cap A center dot open paren modified negative 3 with boxed outline x y close paren equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
?⋅−3??=9?3?+3??3−8?2?2
Nhân một số dương với một số âm sẽ cho ta một số âm: (+)⋅(-)=(-)open paren + close paren center dot open paren - close paren equals open paren - close paren
(+)⋅(-)=(-)
−A⋅3xy=9x3y+3xy3−8x2y2modified negative cap A with boxed outline center dot 3 x y equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
−?⋅3??=9?3?+3??3−8?2?2
Bước
−A⋅3xy=9x3y+3xy3−8x2y2negative cap A center dot 3 x y equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
−?⋅3??=9?3?+3??3−8?2?2
 
−A⋅3xy=9x3y+3xy3−8x2y2modified negative cap A center dot 3 with boxed outline x y equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
−?⋅3??=9?3?+3??3−8?2?2
Dùng tính giao hoán để sắp xếp lại các số hạng
-3Axy=9x3y+3xy3−8x2y2modified negative 3 cap A with boxed outline x y equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
−3???=9?3?+3??3−8?2?2
Bước
-3Axy=9x3y+3xy3−8x2y2negative 3 cap A x y equals 9 x cubed y plus 3 x y cubed minus 8 x squared y squared
−3???=9?3?+3??3−8?2?2
 
-3Axy=9x3y+3xy3−8x2y2negative 3 cap A x y equals modified 9 x cubed y plus 3 x y cubed minus 8 x squared y squared with boxed outline
−3???=9?3?+3??3−8?2?2
Chuyển biểu thức bên phải sang bên trái và đổi dấu
-3Axy−9x3y−3xy3+8x2y2=0modified negative 3 cap A x y minus 9 x cubed y minus 3 x y cubed plus 8 x squared y squared with boxed outline equals modified 0 with boxed outline
−3???−9?3?−3??3+8?2?2=0
Bước
-3Axy−9x3y−3xy3+8x2y2=0negative 3 cap A x y minus 9 x cubed y minus 3 x y cubed plus 8 x squared y squared equals 0
−3???−9?3?−3??3+8?2?2=0
 
-3Axy−9x3y−3xy3+8x2y2=0modified negative 3 cap A x y minus 9 x cubed y minus 3 x y cubed plus 8 x squared y squared with boxed outline equals 0
−3???−9?3?−3??3+8?2?2=0
Rút −xynegative x y
−??
ra làm thừa số chung
−xy⋅(3A+9x2+3y2−8xy)=0modified negative x y center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 x y close paren with boxed outline equals 0
−??⋅3?+9?2+3?2−8??=0
Bước
−xy⋅(3A+9x2+3y2−8xy)=0negative x y center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 x y close paren equals 0
−??⋅3?+9?2+3?2−8??=0
 
−xy⋅(3A+9x2+3y2−8xy)=0modified negative x y with boxed outline center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 x y close paren equals 0
−??⋅3?+9?2+3?2−8??=0
Chia hai vế của phương trình cho −xnegative x
−?
y⋅(3A+9x2+3y2−8xy)=0modified y with boxed outline center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 x y close paren equals 0
?⋅3?+9?2+3?2−8??=0
Bước
y⋅(3A+9x2+3y2−8xy)=0y center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 x y close paren equals 0
?⋅3?+9?2+3?2−8??=0
 
y⋅(3A+9x2+3y2−8xy)=0modified y center dot open paren 3 cap A plus 9 x squared plus 3 y squared minus 8 x y close paren equals 0 with boxed outline
?⋅3?+9?2+3?2−8??=0
Khi tích của hai hạng tử bằng 00
0
, thì ít nhất một trong hai hạng tử đó phải bằng 00
0
 
Bước
y=03A+9x2+3y2−8xy=02 lines; Line 1: y equals 0; Line 2: 3 cap A plus 9 x squared plus 3 y squared minus 8 x y equals 0 end-lines;
?=03?+9?2+3?2−8??=0
 
y=03A+9x2+3y2−8xy=02 lines; Line 1: y equals 0; Line 2: modified 3 cap A plus 9 x squared plus 3 y squared minus 8 x y equals 0 with boxed outline end-lines;
?=03?+9?2+3?2−8??=0
Giải phương trình yy
?
y=0y=4x+-11x2−9A3y=4x−-11x2−9A33 lines; Line 1: y equals 0; Line 2: modified y equals the fraction with numerator 4 x plus the square root of negative 11 x squared minus 9 cap A end-root and denominator 3 end-fraction with boxed outline; Line 3: modified y equals the fraction with numerator 4 x minus the square root of negative 11 x squared minus 9 cap A end-root and denominator 3 end-fraction with boxed outline end-lines;
?=0?=4?+−11?2−9?√3?=4?−−11?2−9?√3
Đáp án
y=0y=4x+-11x2−9A3y=4x−-11x2−9A33 lines; Line 1: y equals 0; Line 2: y equals the fraction with numerator 4 x plus the square root of negative 11 x squared minus 9 cap A end-root and denominator 3 end-fraction; Line 3: y equals the fraction with numerator 4 x minus the square root of negative 11 x squared minus 9 cap A end-root and denominator 3 end-fraction end-lines;
?=0?=4?+−11?2−9?√3?=4?−−11?2−9?√3