15/16÷(5/12÷5/8+3/8)6/7-6/7×(2/3+1/9)【1-(1-2/3÷
15/16÷(5/12÷5/8+3/8)
6/7-6/7×(2/3+1/9)
【1-(1-2/3÷2/3)】×18/19
(5/6-1/4×2/3)÷1/6
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