【x(xy-xy)-y(x-xy)】÷3xy

【x(xy-xy)-y(x-xy)】÷3xy -x-3xy+y 2x²y-3(2xy-xy)-xy 计算：( 根号xy-xy/x+根号xy)÷根号xy-y/x-y= |x|/x+y/|y|+xy/|xy|= ((xy+2)(xy-2)-2x²y²+5(xy-y)²)÷(2xy) (x^2-xy)y÷y-x/xy怎么做? 计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x） 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程 xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 计算：(xy-x²)×x-y/xy 【xy-x²】*xy/x-y （3x²y-xy²+1/2xy)÷（-1/2xy) （3x²y-xy²+1/2xy)÷（-1/2xy) (3x^2y-xy^2+二分之一xy)÷(-二分之一xy) 3xy^2-(XY^2-2X^2Y)÷(1/2xy) 计算(2xy的平方-3x的平方y+2xy)÷2xy结果