怎样简便就怎样算 2/3除5/8+1/3除5/8 7/12乘1/3+5/12除3

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怎样简便就怎样算 2/3除5/8+1/3除5/8 7/12乘1/3+5/12除3
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怎样简便就怎样算 2/3除5/8+1/3除5/8 7/12乘1/3+5/12除3
怎样简便就怎样算 2/3除5/8+1/3除5/8 7/12乘1/3+5/12除3

怎样简便就怎样算 2/3除5/8+1/3除5/8 7/12乘1/3+5/12除3
2/3除5/8+1/3除5/8
=2/3乘8/5+1/3乘8/5
=(2/3+1/3)乘8/5
=1乘8/5
=8/5
7/12乘1/3+5/12除3
= 7/12乘1/3+5/12乘1/3
=(7/12+5/12)乘1/3
=1乘1/3
=1/3

2/3除5/8+1/3除5/8
=(2/3+1/3)÷5/8
=1×8/5
=8/5
7/12乘1/3+5/12除3
=7/12乘1/3+5/12×1/3
=(7/12+5/12)×1/3
=1乘1/3
=1/3