Em tách ra mỗi lần hỏi đăng 1-3 bài thôi để nhận hỗ trợ sớm nhất nha em!

Bài 1 

a) 2x+6=0

<=> 2x=-6

x=-3

b) 15 -7x=9-3x

<=> -4x=-6

<=>x=\(\dfrac{3}{2}\)

c) 2(x+1)=5x-7

<=>2x+2=5x-7

<=>-3x=-9x

<=>x=3

pt tích

a) x²-2x=0

x(x-2)=0

x=0 hoặc x-2=0   <=> x=2

b) x(x-3)=0

x=0 hoặc x-3=0 <=> x=3

c) (x-3)(2x+5)=0

\(<=>\begin{cases} (x-3=0)\\ (2x+5=0) \end{cases} \)\(\left[\begin{array}{} (x=3)\\ (x=-5/2) \end{array} \right.\)

d) (x-2)(2x-6)=0

\(<=>\begin{cases} (x-2=0)\\ (2x-6=0) \end{cases} \)\(<=>\left[\begin{array}{} (x=2)\\ (x=3) \end{array} \right.\)

21D

22A và D

23C

24B

Góc x'Oy' = góc xOy = 70^ovì 2 góc đối đỉnh thì bằng nhau.

vì \(\stackrel\frown{X'OY'}\)

đối đỉnh với \(\widehat{XOY}\)

nên \(\widehat{X'OY'=70^o}\)

Làm nhanh cho mình nha, mình cần gấp.

1 He is told to take a long rest

2 This plant isn't watered everyday

3 Beer is drunk all over the world

4 Uniform is worn to school by students

5 Reports are sent to the manager by the secretary in the afternoon

6 How many languages are spoken in Canada?

Bài 2

1 I was brought this dish by the waiter

2 I wasn't showed the special cameras 

3 Her ticket was showed to her friends

4 The broken cup was hidden in the drawer by Tom

5 The fridge wasmoved into the living room by his uncle