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x2_x_1=0
x2+x+1=0 x+1+1/x=0
{x|x∈r x2+1=0}
x2^x=1
x2十x一1=0
x2+x-2>0
x2-x+1/(x-1)2
x2一x一2=0
x2-x-2<0
x2_x_2=0
x2+x-2=0
-x2-x+2<0
x2-1<0
limx→1 x2-x+1/(x-1)2
x2/(x-1)10
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