3Y 2XY---- + ---------2X+2Y (X^2)+XY
(xy-x^2)乘以(xy)/(x-y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
(x^2+xy/x-y)/(xy/x-y)计算
x^2-xy-6y^2+3xy+y+2
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(-3x^y+2xy)-( )=4x^+xy
(x+y-2xy)(x+y-2)+(1-xy)²
(x^2-xy)y÷y-x/xy怎么做?
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
(x+y)(x-y)-(2xy+3y)平方