(7/25/7/5+4/25*5/4)/8/9简便计算快_数学解答

(7/25/7/5+4/25*5/4)/8/9简便计算快

人气：469 ℃　时间：2020-01-29 01:26:06

解答

[（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