化简4xy-y-xy+x

化简4xy-y-xy+x 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y（化简） 化简[x-y+4xy/(x-y)][x+y-4xy/(x-y)] 化简:(x+y-4xy/x+y)*(x-y-4xy/x-y)= 化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy}化简：2x²y+{2xy-[3x²y-2(-3x²y+2xy)]-4xy} 3xy+xy+3+4xy-7化简,已知x=5,y=6 (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) 化简2(x²y+xy)-3(x²y-xy)-4x²y 化简3（x²y+xy)-4(x²y-xy)-5x²y, 化简（x-y)的平方+4xy, 化简 2（xy-xy²+3）-（-4xy²+xy-1） 其中,x等于--4,y等于-3 化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y² 【x(xy-xy)-y(x-xy)】÷3xy 化简xy-1-x+y xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程 3（x的2次方y+xy）-4（xy-2x的2次方y）-（-xy）化简