Question

19/25*7/31+7/25*6*31怎么方便计算?

Answer 1

木子2659,
19/25×7/31＋7/25×6/31
＝19/25×7/31＋6/25×7/31
＝（19/25＋6/25）×7/31
＝1×7/31
＝7/31