2/3-(5/6-3/4)÷3/8 和 5/14÷{6/7×(4/9+1/6)} 注{ 为大括号

如题所述

第1个回答  2012-10-25
2/3-(5/6-3/4)÷3/8
=2/3-1/12×8/3
=2/3-2/9
=4/9

5/14÷{6/7×(4/9+1/6)}

=5/14÷(6/7×7/18)
=5/14÷1/3
=15/14本回答被提问者和网友采纳
第2个回答  2012-10-25
2/3-(5/6-3/4)÷3/8
=2/3-1/12×8/3
=2/3-2/9
=4/9

5/14÷{6/7×(4/9+1/6)}
=5/14÷{6/7×11/18}
=5/14÷11/21
=15/22
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