(x^2-xy+0.25x^2)/4x^2-y^2
(xy-x^2)乘以(xy)/(x-y)
(x^2+xy/x-y)/(xy/x-y)计算
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(-3x^y+2xy)-( )=4x^+xy
因式分解:x×x-xy-2y×y-x-y
x^2y+4xy+4y
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
作乘法:(x+y)(x^2-xy+y^2);(x-y)(x^2+xy+y^2)
(x+y-2xy)(x+y-2)+(1-xy)²
(x^2-xy)y÷y-x/xy怎么做?