а) 100*(8+7) = 100*15 = 1500
б) (57-42)*1000 = 15*1000 = 15000
в) (32+24):7 = 56:7 = 8
г) 81:(77-68) = 81:9 = 9
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а) 100*(8+7) = 100*15 = 1500
б) (57-42)*1000 = 15*1000 = 15000
в) (32+24):7 = 56:7 = 8
г) 81:(77-68) = 81:9 = 9