(7/25/7/5+4/25*5/4)/8/9简便计算快
问题描述：
(7/25/7/5+4/25*5/4)/8/9简便计算快
答
前面的括号中少了一个运算符，我按7/25*7/5计算试试看：[（7/25）*（7/5）+(4/25)(5/4)]/(8/9)=[49/125+1/5]/(8/9)=(74/125)/(8/9)=(74/125)*(8/9)=666/1000=0.666
答
[（7/25）*（7/5）+(4/25)(5/4)]/(8/9)=[49/125+1/5]/(8/9)=(74/125)/(8/9)=(74/125)*(8/9)=666/1000=0.666