(3x²y-xy²+2xy)÷1/2xy=?(要有过程)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
若x=1/2,y=1,求x(x的平方+xy+y的平方)-y(x的平方+xy+y的平方)+3xy(y-x)的值(要有过程)
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
(1)先化简,再求值:[4(xy-1)²-(xy+2)(2-xy)]÷1/4xy,其中x=-2,y=1/5.
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
(1)-2分之1xy(3y²-2xy+3x²y)