1/3X-1-2X=-1
等式两边同时乘以3x
得1-3x-6x²=-3x
即6x²-3x+3X-1=0
6X²-1=0
6x²=1
x²=1/6
x=±√(1/6)
x1=√(1/6) ;x2=-√(1/6)
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