(1)3xy-4xy-(-2xy)
【(2+xy)(xy-2)-xy(xy+1)+4】/(-2xy) 一道计算题!
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
3xy-3xy-xy+2yx
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
1.-3/1(三分之一) xy^2+4xy-6x=?
3(xy-xy)-2(xy+xy)+3xy
当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值
(-1/3xy)∧2*[3xy(2x-y)-3x(2xy-4y∧2)]
(3x的2次方y-xy的2次方+1/2xy)/(-1/2xy)=?