5(x²-x)-3(x²+x)=0
5(x²-x)-3(x²+x)=0
5(x²-x)=3(x²+x)
3x²-x=0,求6x³+7x²-5x+2006
已知x²-5x-1=0,则x²+1/x²=?,x²/x&sup4+x²+1
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
3x²=150-5x
|x+2y+3|+(2x+y)²=0求x²-xy+y²
2x²+3x+2/2x²-3X-2=2x²-5x+3/2x²+5X-3
① X²+X-1+0,则2X³+3X²-X=
(x²+5x+6)(x²+7x+6)-3x²
7/x²+x+3/x²-x=6/x²-1