如题所述
25/7÷5/8＋25/3×8/7
= 25/7×8/5＋25/3×8/7
= 25/5×8/7＋25/3×8/7
= 5×8/7＋25/3×8/7
= 5×8/7×(1＋5/3)
= 5×8/7×8/3
= (5×8×8) / (7×3)
= 320/21
= 25/7×8/5＋25/3×8/7
= 25/5×8/7＋25/3×8/7
= 5×8/7＋25/3×8/7
= 5×8/7×(1＋5/3)
= 5×8/7×8/3
= (5×8×8) / (7×3)
= 320/21
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第1个回答 2011-11-09
25/5x8/7+25/3×8/7
