138×1又4分之1+23.3×(2-75%)-125%×38+(1+0.25)×28.7

2025-03-25 04:40:17
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回答(1):

原式=138×(5/4)+23.3×(5/4)-38×(5/4)+28.7×(5/4)
=(138+23.3-38+28.7)×(5/4)
=152×(5/4)
=190