7.5×46.7+39.9×2.5等于多少（简便运算）_数学解答

7.5×46.7+39.9×2.5等于多少（简便运算）

人气：458 ℃　时间：2020-02-02 16:27:42

解答

7.5*46.7+39.9*2.5
=7.5*46.7+(46.7-6.8)*2.5
=46.7*(7.5+2.5)-6.8*(5/2)
=467-17
=450