2.9+29*19+0.29*8+0.1*199简便运算这道题,*这个符号是乘号.

问题描述:

2.9+29*19+0.29*8+0.1*199简便运算这道题,*这个符号是乘号.

2.9+29*19+0.29*8+0.1*199
= 2.9+2.9*190+2.9*0.8+19.9
= 2.9*(1+190+0.8)+19.9
= 2.9*191.8+19.9
= 556.22 +19.9
= 576.12