第1个回答 2011-11-21
1. 3/4÷7/8÷15/14
=3/4×8/7×14/15
=4/5
2.（4/9＋2/15）÷2/15
=4/9×15/2+2/15×15/2
=10/3+1
=13/3
3.3/20÷ 0.2×2/3
=3/20÷1/5×2/3
=3/20×5×2/3
=1/2
=3/4×8/7×14/15
=4/5
2.（4/9＋2/15）÷2/15
=4/9×15/2+2/15×15/2
=10/3+1
=13/3
3.3/20÷ 0.2×2/3
=3/20÷1/5×2/3
=3/20×5×2/3
=1/2
第2个回答 推荐于2016-12-02
3/4÷7/8÷15/14
=3/4*8/7*14/15
=4/5
（4/9＋2/15）÷2/15
=4/9*15/2+1
=10/3+1
=4又1/3
3/20÷ 0.2×2/3
=3/20*5*2/3
=1/2本回答被提问者采纳
=3/4*8/7*14/15
=4/5
（4/9＋2/15）÷2/15
=4/9*15/2+1
=10/3+1
=4又1/3
3/20÷ 0.2×2/3
=3/20*5*2/3
=1/2本回答被提问者采纳
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