若1/2x+3y+7=1/8,则4x²-9x²/(4x²+12xy+9x²)(2
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
若|x-2|+x²+1/4y²-xy=0 x= y=
求代数式的值 6x+2x²-3x+x²+1 其中x=-5 4x+3xy-x²-9 其中x=
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
解方程x²-2xy+y²=9,x²+4xy+4y²+x+2y=2 2x-1/y=
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
几道化简题哦(1)x ² -7x+12 / x ² -4x=(2)xy+x+y+1 / y
x四次方+x³-3x²-4x-4 x(x-1)+y(y+1)-2xy (x-2)³-(y-
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
|x+2|+(y-1/4)²=0,求2(x²y+xy)-3(x²y-xy)-4x²