式
(2/3+4/5)*2/15
=(10/15 + 12/15)*2/15
=22/15 *2/15
=44/225
=(10/15 + 12/15)*2/15
=22/15 *2/15
=44/225
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第1个回答 2012-07-01
(2/3+4/5)*2/15
=2/3*2/15+4/5*2/15
=10/15*2/15+12/15*2/15
=10*2/15*15+12*2/15*15
=20/225+24/225
=44/225
=2/3*2/15+4/5*2/15
=10/15*2/15+12/15*2/15
=10*2/15*15+12*2/15*15
=20/225+24/225
=44/225