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5/10 - 1/5 × 2/3
5/10 - 2/15
11/30
b) 2/3 ×15/4 - ( 1/6 / 1/12 + 1/8 )
30/12 - ( 12/6 + 1/8 )
30/12 - 45/24
15/24
3/8