依据(a1x+c1)(a2x+c2)=a1a2x^2+(a1c2+a2c1)x+c1c2
得：3X^2+2X-1
=3×1·x + （3×1+1×（-1））x + 1×（-1）
=(3x+1)(x-1)
因为算式结果为0
所以,x=-1/3或1
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