用简便方法计笕3×(400-400÷25)

2025-04-13 18:33:20
推荐回答(1个)
回答(1):

3×(400-400÷25)
=3×(400-400÷5÷5)
=3×(400-16)
=3×400-3x16
=1200-48
=1152

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