[1/(1-x)]-[(3x-x2)/(1-x)]=2 求x的值
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6x2-[-3x2-(x-1)] 化简
约分 1-x2/x2-3x-4
3/x2 -3x+2-1/x-2=1/x2 -x+4/x2 -2x
化简x(x2-3)+x2(x-3)-3x(x2-x-1)
通分 3x/x2-2x,2x+1/4-x2,3/2x2+4x
x2-3x+1=0 x2/(x4-x2+1)
计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2
x+1/x=3,求x2/x4+x2+1
lim x-∞ x2-1/3x2+x 求极限
解方程:X2--1/8(X2+2X)+X2+2X/3(X2--1)=11
化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2
2-3X/X2+X+1>3
2x-(3x-1)+2(x2)
(x-1)(x2-3x+2)
x2-3x-1=0,求①x2 1/x2;②x2-1/x2
函数f(x)=3x/x2+x+1 (x
函数f(x)=3x/x2+x+1 (x
(x+1)(x2-x+1)+(x-2)(x2+2x+4),其中x=-3/2