
4x^2y+5xy-7x)-(5x^2y+4xy+x);-(10x^3+2xy^2+y^3)+(10x^2+3xy^2-8y^2)详细一点 40
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4x^2y+5xy-7x)-(5x^2y+4xy+x)
=4x²y+5xy-7x-5x²y-4xy-x
=xy-8x-x²y
=x(y-8-xy﹚
-(10x^3+2xy^2+y^3)+(10x^2+3xy^2-8y^2)
=-10x³-2xy²-y³+10x²+3xy²-8y²
=-10x³-y³+10x²+xy²-8y²
=10x²﹙1-x﹚+y²﹙x-8-y)
=4x²y+5xy-7x-5x²y-4xy-x
=xy-8x-x²y
=x(y-8-xy﹚
-(10x^3+2xy^2+y^3)+(10x^2+3xy^2-8y^2)
=-10x³-2xy²-y³+10x²+3xy²-8y²
=-10x³-y³+10x²+xy²-8y²
=10x²﹙1-x﹚+y²﹙x-8-y)
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(4x²y+5xy-7x)-(5x²y+4xy+x)
=4x²y+5xy-7x-5x²y-4xy-x
=(4x²y-5x²y)+(5xy-4xy)+(-7x-x)
=-x²y+xy-8x
-(10x³+2xy²+y³)+(10x²+3xy²-8y²)
=-10x³-2xy²-y³+10x²+3xy²-8y²
=-10x³+(-2xy²+3xy²)-y³+10x²-8y²
=-10x³+xy²-y³+10x²-8y²
=4x²y+5xy-7x-5x²y-4xy-x
=(4x²y-5x²y)+(5xy-4xy)+(-7x-x)
=-x²y+xy-8x
-(10x³+2xy²+y³)+(10x²+3xy²-8y²)
=-10x³-2xy²-y³+10x²+3xy²-8y²
=-10x³+(-2xy²+3xy²)-y³+10x²-8y²
=-10x³+xy²-y³+10x²-8y²
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-x^2y+xy-8x;
10x^2*(1-x)+xy^2-y^2*(y+8)
10x^2*(1-x)+xy^2-y^2*(y+8)
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