化简(a²-2ab)-(3a²+3ab)=( )分解因式 ab-a+b-1=( )因式分解 2xy-x²-y²+1

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化简(a²-2ab)-(3a²+3ab)=()分解因式ab-a+b-1=()因式分解2xy-x²-y²+1化简(a²-2ab)-(3a²+3

化简(a²-2ab)-(3a²+3ab)=( )分解因式 ab-a+b-1=( )因式分解 2xy-x²-y²+1
化简(a²-2ab)-(3a²+3ab)=( )
分解因式 ab-a+b-1=( )
因式分解 2xy-x²-y²+1

化简(a²-2ab)-(3a²+3ab)=( )分解因式 ab-a+b-1=( )因式分解 2xy-x²-y²+1
(a²-2ab)-(3a²+3ab)
=a²-2ab-3a²-3ab
=-2a²-5ab
=-a(2a+5b)
ab-a+b-1
=a(b-1)+(b-1)
=(a+1)(b-1)
2xy-x²-y²+1
=-(x²-2xy+y²)+1
=-(x-y)²+1
=-[(x-y)²-1]
=-(x-y+1)(x-y-1)

(a²-2ab)-(3a²+3ab)=a²-3a²-2ab-3ab=-2a²-5ab=-a(2a=5b)
ab-a+b-1=a(b-1)+(b-1)=(a+1)(b-1)
2xy-x²-y²+1=1-(x+y)^2=(1-x-y)(1+x+y)

1、原式=a²-2ab-3a²-3ab
=-2a²-5ab
=-a(2a+5b)
2、原式=(ab-a)+(b-1)
=a(b-1)+(b-1)
=(b-1)(a+1)
3 原式=1-(x²-2xy+y²)
=1²-(x-y)²
=(1+x+y)(1-x+y)