问题描述：
7/10×5/16÷32分之21 3/5+1/2×5分之四 2/13÷15/26×8分之五 (7/8+3/16)16分之13 9/17×1/7+17分之五÷7 3x(2/15+1/12)-2/5
最佳答案：
(1)7/10×5/16÷32分之21
=7/10×5/16×32/21
=1/3
(2)3/5+1/2×5分之四
=3/5+4/10
=6/10+4/10
=1
(3)2/13÷15/26×8分之五
=2/13×26/15×5/8
=(2×26×5)/(13×15×8)
=1/6
(4)(7/8+3/16)16分之13
(7/8+3/16)÷13/16
=(14/16+3/16)×16/13
=17/16×16/13
=17/13
（5）9/17×1/7+17分之五÷7
=9/17×/1/7+5/14×1/7
=1/7×(9/17+5/17)
=1/7×14/17
=2/17
（6）3×(2/15+1/12)-2/5
=3×2/15+3×1/12-2/5
=2/5+1/4-2/5
=1/4
