5/6-(1/12+2/15)简便方法8/9-(1/5-1/9)

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5/6-(1/12+2/15)简便方法8/9-(1/5-1/9)

5/6-(1/12+2/15)简便方法8/9-(1/5-1/9)
5/6-(1/12+2/15)简便方法8/9-(1/5-1/9)

5/6-(1/12+2/15)简便方法8/9-(1/5-1/9)
5/6-(1/12+2/15)
=5/6-1/12-2/15
=37/60
8/9-(1/5-1/9)
=8/9-1/5+1/9
=8/9+1/9-1/5
=1-1/5
=4/5