若3a²-a-2=0,则-6a²+2a=要讲解
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若3a²-a-2=0,则-6a²+2a=要讲解若3a²-a-2=0,则-6a²+2a=要讲解若3a²-a-2=0,则-6a²+2a=要讲解3
若3a²-a-2=0,则-6a²+2a=要讲解
若3a²-a-2=0,则-6a²+2a=
要讲解
若3a²-a-2=0,则-6a²+2a=要讲解
3a²-a-2=0,则-6a²+2a=-2(3a²-a)=-4