2M^3-7M^2+2M+3=0

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2M^3-7M^2+2M+3=0
2M^3-7M^2+2M+3=0

2M^3-7M^2+2M+3=0
2M^3-7M^2+2M+3
=2M^3-2M^2-(5M^2-2M-3)
=2M^2(M-1)-(M-1)(5M+3)
=(M-1)(2M^2-5M-3)
剩下会了吧.