计算下面各题,能简算的请用简便方法计算. 8.38+9.43+6.62 5.86-1.77+2.54 47.2+8.6-7.2 28.6-3.8-14.6-6.2 8-2.6-1.77 7.4+0.93-4.36 17.34-(9.8+6.

问题描述:

计算下面各题,能简算的请用简便方法计算.
8.38+9.43+6.62    
5.86-1.77+2.54 47.2+8.6-7.2      
28.6-3.8-14.6-6.2 8-2.6-1.77         7.4+0.93-4.36
17.34-(9.8+6.34) 0.93+5.45+7.07+4.55.

(1)8.38+9.43+6.62,=8.38+6.62+9.43,=15+9.43,=24.93;(2)5.86-1.77+2.54,=5.86+2.54-1.77,=8.4-1.77,=6.63;(3)47.2+8.6-7.2,=47.2-7.2+8.6,=40+8.6,=48.6;(4)28.6-3.8-14.6-6.2,=(28.6-14.6)...