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= (7/12+34/12)×(12/10-7/10)
=41/12×5/10
=41/24= 1 17/24
b) (5/12:13/6)×(8/5-9/10)
=(5/12×6/13)×(16/10-9/10)
=5/26×7/10=7/52
c)(7/8 : 17/6)×(7/8-31/6)
=(7/8×6/17)×(21/24-124/24)
=21/68×(-103/24)
= (-721/544)