xy²-2xy+2y-4 怎么化简
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xy²-2xy+2y-4 怎么化简
xy²-2xy+2y-4 怎么化简
xy²-2xy+2y-4 怎么化简
xy²-2xy+2y-4=(xy²+2y)-(2xy+4)=y(xy+2)-2(xy+2)=(xy+2)(y-2)
xy²-2xy+2y-4 怎么化简
计算:4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急
因式分解xy²-2xy+2y-4
分解因式xy²-2xy+2y-4
分解因式:xy²-2xy+2y-4
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
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x²-2xy+y²-9
已知2x²-3y²=xy,(xy≠0),求值(4xy-x²)/(xy+2y²)的值
1 3x²+4xy-y²=2 4xy+1-4x²-y²=
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单项式2xy,6x²y²,-3xy,-4x²y²的和为--------------
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整式乘法..1.3xy(x²y-xy²+xy)-xy²(2x²-xy+2x)2.(x-1)(x²-4x+3)-x(x²-5x+2)