(1-1/4乘8/9 )除以7/9 简便计算

问题描述:

(1-1/4乘8/9 )除以7/9 简便计算

(1-1/4乘8/9 )除以7/9
=(1-2/9 )×9/7
=1×9/7-2/9×9/7
=9/7-2/7
=1