2x^3y(-6y)^2+(-5xy)^2(xy)-xy^3*(-2x)^2等于多少

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2x^3y*(-6y)^2+(-5xy)^2*(xy)-xy^3*(-2x)^2等于多少

2x^3y*(-6y)^2+(-5xy)^2*(xy)-xy^3*(-2x)^2
=2x^3y*(36y^2)+(25x^2y^2)*(xy)-xy^3(4x^2)
=72x^3y^3+25x^3y^3-4x^3y^3
=(72+25-4)x^3y^3
=93x^3y^3

由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少? (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 3y/2x+2y + 2xy/x²+xy等于多少过程 3xy+xy+2x²y+yx²+3x²y等于多少如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少 x^2-xy-6y^2+3xy+y+2 x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 已知X+Y分之XY等于3,求-X+3XY-Y分之2X-3XY+2Y 若x-y=5.xy=6,x^2y+xy^2等于多少 1/x-1/y=3 求x-3xy-y/2x-xy-2y 等于多少 2x平方+3xy+2y平方等于多少若x+y=3,xy=1,则(-5x+2)-(3xy+5y)等于多少