原式=1.25x7+1.25x30=1.25x37
=1.25x(40-3)
=1.25x40-1.25x3
=50-3.75
=46.25
标签:
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原式=1.25x7+1.25x30=1.25x37
=1.25x(40-3)
=1.25x40-1.25x3
=50-3.75
=46.25
标签: