神马作文网三分之一-[2x-(x2+1/2x-3)]-(2x2+2)化简
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三分之一-[2x-(x2+1/2x-3)]-(2x2+2)化简
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
解方程：X2--1/8(X2+2X)+X2+2X/3(X2--1)=11
化简x-1分之x+1-x2-1分之x2-2x÷x2-x-2/x2+2x+1
x2+3x+9/x2-27+6x/9x-x2-x-1/6+2x 化简
化简x2+3x+9/x2-27+6x/9x-x2-x-1/6+2x
解方程 x2+x-1/(x2+x)=3/2
解方程：1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
2x-(3x-1)+2(x2)
5x2—[x2+(4x—x2)—2(x2—3x)]
（-2x2+3x）-[5x-（2x2+1）-x2]．
解方程2/x2+x+3/x2-x=4/x2-1