7分之6乘以25分之21除以5分之3=5分之6
6/7x21/25÷3/5
=126/175÷3/5
=18/25x5/3
=90/75
=6/5
7分之6x25分之21÷5分之3
=25分之18x3分之5
=25分之5x3分之18
=5分之1x6
=5分之6
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望采纳！O(∩_∩)O
6/7?X?21/25??/?(3/5)
=?18/25?X?5/3
=?6/5
追答 : 答案是：5分之6
答：3×2/13+4×3/7+5×4/13+6×5/7=1/13×（3×2+5×4）+1/7×（3×4+5×6）=2+6=8详情>>
答：详情>>
