第1个回答 2013-10-12
原式=(2/3+1/4+1/12+1/24)+(2/15+2/35)
=(16/24+6/24+2/24+1/24)+(14/105+6/105)
=25/24+20/105=25/24+4/21=175/168+32/168=207/168=69/56
=(16/24+6/24+2/24+1/24)+(14/105+6/105)
=25/24+20/105=25/24+4/21=175/168+32/168=207/168=69/56
第2个回答 2013-10-12
8/12+3/12+1/12+2/15+2/35+1/24
=1+1/24+2/15+2/35
=25/24+14/105+6/105
=25/24+4/21
=175/168+32/168
=69/56
=1+1/24+2/15+2/35
=25/24+14/105+6/105
=25/24+4/21
=175/168+32/168
=69/56
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