34.5ᘧ࿾76.5-345ᘧ࿾6.42-123ᘧ࿾1.45的简便计算的方法是什么?

2025-06-26 17:07:22
推荐回答(3个)
回答1:

34.5×76.5-345×6.42-123×1.45
=34.5×76.5-34.5×64.2-12.3×14.5
=34.5×(76.5-64.2)-12.3×14.5
=34.5×12.3-12.3×14.5
=12.3×(34.5-14.5)
=12.3×20
=246

回答2:

原式

回答3:

34.5✖️76.5-345✖️6.42-123✖️1.45
=3.45×765-3.45×642-123×1.45
=3.45×(765-642)-123×1.45
=3.45×123-123×1.45
=123×(3.45-1.45)
=123×2
=246
加油