15又8/13-(7又7/8+2又8/13)
=15又8/13-7又7/8-2又8/13
=(15又8/13-2又8/13)-7又7/8
=13-7又7/8
=(12-7)+(1-7/8)
=5+1/8
=5又1/8
还有一道题不太明白 虽知道了答案 也是简便运算的一题!你回答的很不错!
15又8/13-(7又7/8+2又8/13)
=15又8/13-7又7/8-2又8/13
=(15又8/13-2又8/13)-7又7/8
=13-7又7/8
=(12-7)+(1-7/8)
=5+1/8
=5又1/8