设M=3a^3-10a^2-5,N=-2a^3+5-10a,P=7-5a-2a^2,求2M+3N-3P的值

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设M=3a^3-10a^2-5,N=-2a^3+5-10a,P=7-5a-2a^2,求2M+3N-3P的值
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设M=3a^3-10a^2-5,N=-2a^3+5-10a,P=7-5a-2a^2,求2M+3N-3P的值
设M=3a^3-10a^2-5,N=-2a^3+5-10a,P=7-5a-2a^2,求2M+3N-3P的值

设M=3a^3-10a^2-5,N=-2a^3+5-10a,P=7-5a-2a^2,求2M+3N-3P的值
原式=2(3a^3-10a^2-5)+3(-2a^3+5-10a)-3(7-5a-2a^2)
=6a^3-20a^2-10-6a^3+15-30a-21+15a+6a^2
=-14a^2-15a-16