2016-11-07 12:08发布
5/9 × 3/10 + 2/7 ÷ 3/5
=5/9 × 3/10 + 2/7 × 5/3
=1/6 + 10/21
=7/42 + 20/42
=9/14
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5/9 × 3/10 + 2/7 ÷ 3/5
=5/9 × 3/10 + 2/7 × 5/3
=1/6 + 10/21
=7/42 + 20/42
=9/14
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