xy-[x+2y+0.5(x-4)*(y-2)]
xy-[x+2y+0.5(x-4)*(y-2)]
x^2y+4xy+4y
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(xy-x^2)乘以(xy)/(x-y)
(x^2+xy/x-y)/(xy/x-y)计算
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
因式分解:x×x-xy-2y×y-x-y
(-3x^y+2xy)-( )=4x^+xy
(-x-2y)(x²-2xy+4y²)
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
作乘法:(x+y)(x^2-xy+y^2);(x-y)(x^2+xy+y^2)