【-(-2x^2y)^3】^2*(-3x^3y2)
x/x-y*y^2/x+y-x^3y2/x^4-y^4/x^2/x^2+y^2
【-(-2x^2y)^3】^2*(-3x^3y2)
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
x2-2xy+y2+3x-3y+2.
(4x-3y)2-16y2.
2x2+xy-3y2+x+4y-1因式分解
求解初中数学题(x-y)-2(y-x) 2(x-y)-8(y-x) x(a-3)-(3-a) (x2-y2)-3(x+y
(x+3y)2+2(x2-y2)(x2+y2)+(x-3y)2.
解方程组:y2=x3-3x2+2x;x2=y3-3y2+2y
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
解方程组:x+y2=3x−2y=10+6x+y4
已知实数x,y 满足x2+y2+2x-2√3y=0求: