如题所述
解ï¼
28/55*(3/5-2/7)
=28/55*(21/35-10/35)
=28/55*11/35
=4*7/5*11* 11/5*7
=4/5*1/5
=4/25
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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28/55*(3/5-2/7)
=28/55*(21/35-10/35)
=28/55*11/35
=4*7/5*11* 11/5*7
=4/5*1/5
=4/25
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
ç¥ä½ å¦ä¹ è¿æ¥ï¼æ´ä¸ä¸å±æ¥¼ï¼
ä¸æç½è¯·åæ¶è¿½é®ï¼æ»¡ææ¬è¯·é纳ï¼O(â©_â©)O谢谢~~
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第1个回答 2014-08-23
28/55x(3/5一2/7)
=28/55x11/35
=4/25
=28/55x11/35
=4/25
