化简:M-[N+(2M-N)]
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化简:M-[N+(2M-N)]化简:M-[N+(2M-N)]化简:M-[N+(2M-N)]M-[N+(2M-N)]=M-N-(2M-N)=M-N-2M+N=-M
化简:M-[N+(2M-N)]
化简:M-[N+(2M-N)]
化简:M-[N+(2M-N)]
M - [N + (2M - N)]
= M - N - (2M - N)
= M - N - 2M + N
= -M
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