1、(-2x²)²×(-3x)³ 2、-10xy乘

1、(-2x²)²×(-3x)³ 2、-10xy乘（-2²y-3xy²

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(3xy^2)^3乘[xy(2x-y)-2x(xy-y^2)].其中x=2 y=1/2
第一题：(3xy^2)^2+(-xy^3)×(-4xy) 第二题：（2x^3y)2×（-2xy)+(-2x^3y)^3×
XY=1,X+Y=3,则3XY+10Y+[5X-(2XY+2Y-3X)]
x^y乘（2xy-3xy^2)=___________________=________________
计算：-3/4（-2x^2y)^2乘以9(-1/3xy)-(-xy)^3乘以（-x^2)
3x^2 y+{xy-[3x^2 y-(4xy^2 +1/2xy)]-(4x^2 y+3/2xy)}
(-x)^2×x^3×(-2y)^3+(-2xy)^2×(-x)^3×y
计算：（x|x^2－xy)^﹣3×（﹣x^2－2xy＋y^2)﹣2÷（x^2|xy－y^2)^2＝
xy+ 2=0,x+y-3=0求(3xy+10y))+[5x-(2xy+2y-3x)]
(-1/2x²y）³×（-3xy²）²