2.57+2.86-0.66+1.63怎么简便?

2025-04-28 01:11:24
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回答1:

2.57+2.86-0.66+1.63怎么简便?

2.57+2.86-0.66+1.63
=(2.57+1.63)+(2.86-0.66)
=4.2+2.2
=6.4