(3xy²)²+(-4xy³)*(-xy)
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
3x²y-﹛xy-[3xy-(4xy²+½xy)]-4x²y﹜
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
-2y³+(3xy²-x²y)-2(xy²-y³)
计算:(-7x²y)(2x²y-3xy³+xy)
(xy^-1)²*(-xy^4)^-1*(-y²x^-1)³等于
计算(-4xy)乘(xy+3x²y)
1、xy²+2xy-x(因式分解)
计算:(xy-x²)乘 x-y分之xy