这两道题怎么简算2/3除【 [ 2/3+1/5] - 知识问答

这两道题怎么简算2/3除【 [ 2/3+1/5]乘1/26】 8/17除23+1/23乘9/17

2个回答

2/3除【 [ 2/3+1/5]乘1/26】
=2/3÷[(10/15+3/15)×1/16]
=2/3÷(13/15×1/16)
=2/3÷13/240
=2/3×240/13
=160/13
=12又4/13
8/17除23+1/23乘9/17
=8/17×1/23+1/23×9/17
=(8/17+9/17)×1/23
=1×1/23
=1/23

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