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+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)
化简:5(a²b-3ab²)-2(2a²-7ab²)
3ab·(a²b-ab²+ab)-ab²(2a²-3ab+2a)
3ab(a²b-ab²-ab)-ab²(2a²-3ab+2a)
化简5ab-[2(2a²-ab-b²)-3(a²+b²)]-3(ab-2b²)
7a²b+(-4a²+5ab²)-(2a²-3ab²)
3(a²-2ab)-2(3ab-b²)
化简(a²-2ab)-(3a²+3ab)=( )分解因式 ab-a+b-1=( )因式分解 2xy-x²-y²+1
计算:2ab[(2ab)²-3b(ab+a²b)-ab²]
合并同类项5a²b-3ab-4ab²+7ab-2ab²
化简 (a²-ab+2b²)-2(b²-a²)
化简:(b²-a²)/(a²-2ab+b²)
计算:4a²+3b²-4a²+2ab-4b²
化简:a²-ab-2b²/a+b + b²-a²/a三次方-b三次方 * a²+b²+ab
2a²+3ab+b²-a²-ab-2b²,其中a²-b²=2,ab=-3
已知a²-ab=3,ab+b²=-5,求代数式a²+b²与a²-2ab-b²
如果a²+ab=4,ab+b²=-1,a²+b²等于多少?那么a²+3ab+2b²等于多少?
a²+ab=4 ab+b²=-1 那么a²-b²=( ) a²+3ab+2b²=( )
如果a²+ab=4,ab+b²=-1.那么a²-b²等于多少?a²+3ab+2b²等于多少