x2•(—xy3)•y2—x3•y3•(—y)2等于多少?
1个回答
x^2•(—xy^3)•y^2—x^3•y^3•(—y)^2
=-x^3y^5-x^3y^5
=-2x^3y^5
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已知A=x3-2y3+3x2y+xy2-3xy+4,B=y3-x3-4x2y-3xy-3xy2+3,C=y3+x2y+2
已知A=x3-2y3+3x2y+xy2-3xy+4,B=y3-x3-4x2y-3xy-3xy2+3,C=y3+x2y+2