化简:(x2-2x+1)/(x2+1)除以(x-1)/(x2+x)-x
分式计算:2x/x2-x-2÷(1-x/x+1)-x2+2x/x2-4
(-2x2+3x)-[5x-(2x2+1)-x2].
(x2+5x+4)2+2(x2+5x+4)2+1=(x2+.
化简:根号(x2+6x+9)+根号(x2-2x+1)-根号(x2-4x+4)
解方程7/(x+x2)-3/(x-x2)=6/(x2-1)
计算:(1)x2+9xx2+3x+x2−9x2+6x+9
求 F(x)=X2-1/X2+x-1/X 的最小值(X小于0)
∫(x+x2)/√(1+x2)dx
解方程 x(x-6)+2x(x-3)=3(x2-x-1) 解不等式:2x2(x-3)+4(x2-x)≥x(2x2-2x+
化简x-1分之x+1-x2-1分之x2-2x÷x2-x-2/x2+2x+1
已知x2+3x+1=0,求(1)x+1/x,(2)x2+1/x2+2x+2/x的值
(1) 2x²(x2+2x-3)