搜搜做题作业网计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x&s
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计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]
急
急
4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]}
=4xy²-3x²y-3x²y+[2xy²-4x²y+2(x²y-2xy²)】
=4xy²-6x²y+2xy²-4x²y+2(x²y-2xy²)
=6xy²-10x²y+2x²y-4xy²
=2xy²-8x²y
=4xy²-3x²y-3x²y+[2xy²-4x²y+2(x²y-2xy²)】
=4xy²-6x²y+2xy²-4x²y+2(x²y-2xy²)
=6xy²-10x²y+2x²y-4xy²
=2xy²-8x²y
计算:(1).(-2xy²)*(3x²y)²
3x²-4xy+y²
先化简,再求值：3xy²(-x²y+2x³y²)-4xy(-xy²)·
x²-4y²/x²+2xy+y²÷x+2y/2x²+2xy
1-x²+2xy-y²
因式分解 x²-3xy+2y²+x-2
计算：3（2x²-3xy²）-2（2xy²-3x²y）
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
x/y=2,求分式x²-xy+3y²/x²+xy+6y²