【根号169】-【根号1-25/16】乘以【根号1又16/9】
=[根号13²]-[根号9/25]×[根号25/16]
=13-(3/5)×(5/4)
=13-3/4
=12又1/4
希望能帮到你,祝学习进步O(∩_∩)O