5x(m-2)+4x(2-m),其中x=4,m=1
问题描述:
5x(m-2)+4x(2-m),其中x=4,m=1
答
5x(m-2)+4x(2-m)
=5xm-10+8x-4xm
=xm+8x-10
=4×1+8×4-10
=26
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