因式分解请帮下忙!因式分解:1.(x+y)²-4(x+y)-12 2.x²+(k+2)x+(k+1) 3.(x²+3x)²-8(x²+3x)-204.(t² +4t)² -2(t² +4t)-24 5.4a² b² -(a² +b² )²

问题描述:

因式分解请帮下忙!
因式分解:
1.(x+y)²-4(x+y)-12
2.x²+(k+2)x+(k+1)
3.(x²+3x)²-8(x²+3x)-20
4.(t² +4t)² -2(t² +4t)-24
5.4a² b² -(a² +b² )²

1.x

1.(x+y)²-4(x+y)-12 =(x+y-6)(x+y+2)2.x²+(k+2)x+(k+1) =(x+k+1)(x+1)3.(x²+3x)²-8(x²+3x)-20=(x²+3x-10)(x²+3x+2)=(x²+3x-10)(x+2)(x+1)4....