若M=12p+3q,N=-3q-5p则M-2N=?

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若M=12p+3q,N=-3q-5p则M-2N=?若M=12p+3q,N=-3q-5p则M-2N=?若M=12p+3q,N=-3q-5p则M-2N=?M-2N=(12p+3q)-2(-3q-5p)=1

若M=12p+3q,N=-3q-5p则M-2N=?
若M=12p+3q,N=-3q-5p则M-2N=?

若M=12p+3q,N=-3q-5p则M-2N=?
M - 2N
= (12p + 3q) - 2(-3q - 5p)
= 12p + 3q + 6q + 10p
= 22p + 9q