Question

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Answer 1

Bài 1:
a) \(3,58 \times 24,12 + 3,58 \times 75,55\)
\(= (3,58 \times (24,12 + 75,55))\)
\(= 3,58 \times 99,67\)
\(= 360,1046\)

b) \( \frac{4}{19} \times -\frac{5}{12} + \frac{4}{19} \times -\frac{7}{2} \)
\( = \frac{4}{19} \times (-\frac{5}{12} - \frac{7}{2}) \)
\( = \frac{4}{19} \times (-\frac{5}{12} - \frac{42}{12}) \)
\( = \frac{4}{19} \times (-\frac{47}{12}) \)
\( = -\frac{188}{228} \)
\( = -\frac{47}{57} \)

Bài 2:
a) \( x - \frac{3}{4} = \frac{7}{6} \)
\( x = \frac{7}{6} + \frac{3}{4} \)
\( x = \frac{7}{6} + \frac{9}{12} \)
\( x = \frac{7}{6} + \frac{18}{12} \)
\( x = \frac{7}{6} + \frac{18}{12} \)
\( x = \frac{14 + 18}{12} \)
\( x = \frac{32}{12} \)
\( x = \frac{8}{3} \)

b) \( \frac{x - \frac{1}{2}}{\frac{5}{11}} = \frac{11}{4} \)
\( x - \frac{1}{2} = \frac{11}{4} \times \frac{5}{11} \)
\( x - \frac{1}{2} = \frac{55}{44} \)
\( x = \frac{55}{44} + \frac{1}{2} \)
\( x = \frac{55}{44} + \frac{22}{44} \)
\( x = \frac{77}{44} \)

c) \( (x + 1)^3 + 0.2 = 8\frac{1}{5} \)
\( (x + 1)^3 = 8\frac{1}{5} - 0.2 \)
\( (x + 1)^3 = 8.2 - 0.2 \)
\( (x + 1)^3 = 8 \)
\( x + 1 = \sqrt[3]{8} \)
\( x + 1 = 2 \)
\( x = 2 - 1 \)
\( x = 1 \)

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Answer 2

Bài 1:
a) \(3,58 \times 24,12 + 3,58 \times 75,55\)
\(= (3,58 \times (24,12 + 75,55))\)
\(= 3,58 \times 99,67\)
\(= 360,1046\)

b) \( \frac{4}{19} \times -\frac{5}{12} + \frac{4}{19} \times -\frac{7}{2} \)
\( = \frac{4}{19} \times (-\frac{5}{12} - \frac{7}{2}) \)
\( = \frac{4}{19} \times (-\frac{5}{12} - \frac{42}{12}) \)
\( = \frac{4}{19} \times (-\frac{47}{12}) \)
\( = -\frac{188}{228} \)
\( = -\frac{47}{57} \)

Bài 2:
a) \( x - \frac{3}{4} = \frac{7}{6} \)
\( x = \frac{7}{6} + \frac{3}{4} \)
\( x = \frac{7}{6} + \frac{9}{12} \)
\( x = \frac{7}{6} + \frac{18}{12} \)
\( x = \frac{7}{6} + \frac{18}{12} \)
\( x = \frac{14 + 18}{12} \)
\( x = \frac{32}{12} \)
\( x = \frac{8}{3} \)

b) \( \frac{x - \frac{1}{2}}{\frac{5}{11}} = \frac{11}{4} \)
\( x - \frac{1}{2} = \frac{11}{4} \times \frac{5}{11} \)
\( x - \frac{1}{2} = \frac{55}{44} \)
\( x = \frac{55}{44} + \frac{1}{2} \)
\( x = \frac{55}{44} + \frac{22}{44} \)
\( x = \frac{77}{44} \)

c) \( (x + 1)^3 + 0.2 = 8\frac{1}{5} \)
\( (x + 1)^3 = 8\frac{1}{5} - 0.2 \)
\( (x + 1)^3 = 8.2 - 0.2 \)
\( (x + 1)^3 = 8 \)
\( x + 1 = \sqrt[3]{8} \)
\( x + 1 = 2 \)
\( x = 2 - 1 \)
\( x = 1 \)

Answer 3

`1`

`a) 3,58 xx 24,12 + 3,58 xx 75,55`

`= 86,1696 + 270,269`

`= 356,4386`

`b) 4/19 xx -5/12`

`= (4 xx -5) / (19 xx 12)`

`= -20 / 228`

`= -5 / 57`

`2`

`a) x - 3/4 = 7/6 `

`x - 9/12 = 14/12`

`x = 14/12 + 9/12`

`x = 23/12`

`b(x - 1/2) ÷ 5/11`

`= 11/4(x - 1/2) xx 11/5`

`= 11/4 11(x - 1/2)`

`= 55/4 11x - 11/2`

`= 55/4 11x`

`= 55/4 + 11/2 11x`

`= 55/4 + 22/4 11x`

`= 77/4 x`

`= 77/44 x`

`= 7/4`

`c) (x + 1)^3 + 0.2 = 8 1/5`

`(x + 1)^3 = 8 1/5 - 0.2`

`(x + 1)^3 = 41/5 - 1/5`

`(x + 1)^3 = 40/5`

`(x + 1)^3 = 8`

`x + 1 = 2`

`x = 1`

Số thứ tự	Loại hàng	Số lượng (quyển)	Giá đơn vị (đồng)	Tổng số tiền (đồng)
1	Vở loại 1	35	2000	...
2	Vở loại 2	42	1500	...
3	Vở loại 3	38	1200	...
Cộng:				...

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