4⼀51+4⼀51×16-3⼀21简便方法怎么算?

2025-04-28 15:40:11
推荐回答(2个)
回答1:

回答2:

4/51+4/51×16-3/21
=4/51×(16+1)-3/21
=4/51×17-3/21
=4/3-3/21
=25/21

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