1/6+1/3×9/15
=1/6+1/15
=5/30+2/30
=7/30
(3/8+5/12)x24
=3/8*24+5/12*24
=9+10
=19
35除以[(11/6-2/3)]x24
=35÷5/6×24
=42×24
=1008
(4/3-3/5)除以3/4
=（20/15-9/15)÷3/4
=11/15×4/3
=44/45
5x4/5除以5x4/5
=（5÷5）×（4/5×4/5)
=1×16/25
=16/25
(8/15-9/20)除以(3/4+1/8)
=(32/60-27/60)÷（6/8+1/8)
=1/12÷7/8
=2/21
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