Bài 2: 

a: \(x^2-6x-y^2-4y+5\)

\(=x^2-6x+9-\left(y^2+4y+4\right)\)

\(=\left(x-3\right)^2-\left(y+2\right)^2\)

b: \(4a^2-12a-b^2+2b+8\)

\(=4a^2-12a+9-\left(b^2-2b+1\right)\)

\(=\left(2a-3\right)^2-\left(b-1\right)^2\)

c: \(\left(x+y-3\right)\left(x+y+3\right)\)

\(=\left(x+y\right)^2-3^2\)

d: \(\left(3z+x+2y\right)\left(2y-x+3z\right)\)

\(=\left(2y+3z\right)^2-x^2\)

5A

1B

3C

4D

\(#TyHM\)

a: Xét ΔBAD vuông tại A và ΔBED vuông tại E có 

BD chung

\(\widehat{ABD}=\widehat{EBD}\)

Do đó: ΔBAD=ΔBED

ai giúp e vs ạ

1 such a low bridge that the bus couldn't go under it

2 plays football as well as Tom

3 wake me up at 6 o'clock tomorrow morning" I asked my mother

4 repaired next week

5 her good behavior, everyone likes her

6 her son to be careful when he crossed the street

7 he was seriously ill, he couldn't come

8 old enough to get married

9 the cheapest coat you have

bạn đăng nhỏ câu hỏi ra

Bài 4:

a) đặt f(x)=0

nên 3x-6=0

hay x=2

b) Đặt h(x)=0

nên -5x+30=0

hay x=6

bn ơi bài nào ghi rõ nha

Bài nào, bạn ghi rõ ra mình mới biết nha