13分7x8分5+13分2x16分7_13分1x3又2分1

2025-02-24 07:40:30
推荐回答(1个)
回答1:

7/13×5/8+2/13×7/16-1/13×3又1/2
=7/13×5/8+7/13×2/16-1/13×7/2
=7/13×(5/8+1/8-1/2)
=7/13×1/4
=7/52