简算.9/25×17/26+13/25×7/26

问题描述:

简算.9/25×17/26+13/25×7/26

9/25×17/26+13/25×7/26
=1/25×1/26×(9×17+13×7)
=1/25×1/26×(153+91)
=1/25×1/26×244
=1/25×1/13×122
=122/325
只能这样最简了!