4.4×12.5 脱式 简算 跪求!!

2024-12-17 12:15:26
推荐回答(1个)
回答1:

=(4+0.4)x2.5x5
=4x5x2,5+0.4x5x2.5
=20x2.5+2x2.5
=50+5
=55
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