先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
先化简,再求值:5x²-[2xy-3(1/3xy+2)+4x²]求过程和答案,
化简求值 已知:(x+2)2;+|y+1|=0求5xy²-{2xy²-[3xy²(4xy&
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
先化简,再求值 4(xy²+3xy-2x²y)-[12xy-3(3x²y-2xy²
先化简,再求值4x²+3xy-x²-3xy+9,其中x=-2
先化简,再求值.当x=-1,y=1时,求2(xy-5xy的平方)-(3xy的平方-xy)的值
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
(1)先化简,再求值:[4(xy-1)²-(xy+2)(2-xy)]÷1/4xy,其中x=-2,y=1/5.
先化简,再求值:[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5
先化简,再求值:-4x+7x-5-3x-6x+2,其中x=-2分之1 4xy-3x-xy