3/(x²-x)=6/(x²-1)-7/(x²+x)
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
((x²-5x+6)/(12-7x+x²))²÷((x²+3x+2)/(x
解方程:x(6-x)-2x(x+1)-(x^3-3x^4)/x²=4
6x+(2x²-3x)-(x²-1)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
2X²-X=6,4X²-3X-1=X-2,3X(X-3)=2(X-1)(X+1),
解方程 7/x²+x+6/1-x²=1/x-x²
解方程1/x²-x+ 7/x²+x= 6/x²-1
7/(x²+x)+4/(x²-x)=6/x²-1解方程
解方程(x²-x+4)x-(x-1)(x²+2)=x+7
(x-2)(x-3)+2(x+6)(x-5)-3(x²-7x+13)化简
代数式6x+2x²-3x+x²+1,其中x=-5