Trong mặt phẳng Oxy cho đường thẳng d có phương trình x+y=0. Phép đối xứng trục Oy biến d thành d’ có phương trình;

A. 3x+3y−2=0
B. x−y+2=0
C. x+y+2=0
D. x+y−3=0

a,${\left(\frac{1}{2}\right)}^{15}÷{\left(\frac{1}{4}\right)}^{20}$
b,${\left(\frac{1}{9}\right)}^{25}÷{\left(\frac{1}{3}\right)}^{30}$
c,${\left(\frac{1}{9}\right)}^3÷{\left(\frac{1}{8}\right)}^2$
đ,${\left(x^3\right)}^2÷{\left(x^2\right)}^3$ với x khác 0

1. There is a note_the bottom of the page that accounts_ his theory.

2. It seems the disease broke in a small village in Africa, so you'd better get
inoculated_it before you go.
3. As they came_ heavy fire, the captain ordered his men to fall_
4. What did the children get_ _ while you were shopping?
5. I liked the coat as it caught_but was rather put by the price.
6. We are working the assumption that everyone invited will turn down
7. The chemicals spilled the road and left drivers gasping breath.
8.I used to think he was saying with tongue_cheek, but his behaviour has now got_a
joke.
9. His opinion will count_ a great deal when it comes making a decision.
10. Ruth came late to the party and missed all the fun.
Thanks in advance

$\left|2x-1\right|+x-2=0$

$\frac{1}{x+1}+\frac{x+3}{x-1}=x^2-\frac{2x}{x^2-1}$

$\frac{4}{5}+\frac{7}{15}-\frac{1}{6}$

Cho số 74. Hãy viết vào bên phải số này một số có hai chữ số để được số lớn nhất có 4
chữ số chia hết cho 2 và khi chia cho 5 cũng dư 2.

a) $\frac{x-1}{x+1}+\frac{x-3}{x+2}=2$

b) $\frac{2x+1}{x+2}+\frac{x-3}{x-3}=\frac{3x^2-2x+1}{x^2-x-6}$

$3^a$ +9.b=183

${\left(x-1\right)}^2-4x+3={\left(3x-2\right)}^2$

${\left(3x+1\right)}^2-{\left(1-2x\right)}^2$= 0

(2x-1)(x+1)-$x^2$-2x-1=0

$5\sqrt{x-1}-2\sqrt{x-1}+\sqrt{x-1}=12$

2 +$\frac{4}{5}$ ... 3 điền dấu

Câu 22. Cho tam giác ABC có

$\frac{5}{\sin A}=\frac{6}{SinB}=\frac{7}{\sin C}$

và a = 10 Tính chu vi tam giác đó

D. 36

C. 18

B. 22

A. 24

Rút gọn $\sqrt{{\left(2-\sqrt{3}\right)}^2}+3\sqrt{3}$

$\frac{14}{3}-0,5÷3-\frac{1}{10}+\frac{3}{4}$

3x-$\frac{2y}{37}$ = 5x - $\frac{3z}{15}$= 2z - $\frac{5x}{2}$ và 10x - 3y - 2z = -4

Tại sao khi rót nước ra khỏi bình, thì khi đậy nắp lại, nắp tự động bật ra?