1题
1/2÷4/5÷(2/9×3/8)
=1/2×(5/4×12)
=1/2×15
=7.5
2题枯锋
(5/6-3/4)÷5/12÷9/5
=(5/6-3/4)×12/5×5/9
=(5/6-3/4)×4/3
=5/6×4/3-3/4×4/3
=10/9-1
=1/9
3题
3/橘败核7÷[5/7-(3/7+1/5)]
=3/7÷[5/7-3/7-1/5]
=3/圆掘7÷[2/7-1/5]
=3/7÷3/35
=3/7×35/3
=5
1:二分之十五 2:二十五分之九 3:五
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