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(simple calculation) (7 / 15-1 / 3) / / 1 / 3 + 1 / 5 (3 / 4 + 1 / 2) / / 5 / 8 2 / 13 + 3 / 4 △ 9 / 10 + 1 / 6 [3 / 4 - (5 / 8-1 / 4)] / / 3 / 8
（7/15-1/3）÷（1/3＋1/5)
=（7-5）÷（5+3）
=1/4
（3/4＋1/2)÷5/8
=3/4x8/5+1/2x8/5
=6/5+4/5
=2
2/13＋3/4÷9/10＋1/6
=2/13+5/6+1/6
=2/13+1
=1 and 2 / 13
[3/4-(5/8-1/4)]÷3/8
=(3/4+1/4-5/8)x8/3
=3/8x8/3
=1
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