3x²-12x²y+12xy²=
x²/xy-x/y
计算:(xy-x²)×x-y/xy
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
x+y=0.2,x+3y=1,求3x²+12xy+12y²的值
已知x+y=0.2 x+3y=1 求3x²+12xy+12y²
已知x+y=0.2,x+3y=1.求3X²+12XY+12Y²
x+y=0.2 x+3y=1 求3x²+12xy+12y²的值
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
已知:X+Y=-3,XY=2,X²Y+XY²
先化简,再求值 4(xy²+3xy-2x²y)-[12xy-3(3x²y-2xy²