问题
计算题
下面各题怎样简便就怎样算。
|
答案
(1)3.8+1.94+0.2+1.06 | |
=(3.8+0.2)+(1.94+1.06) | |
=4+3 | |
=7 | (2)31.65-7.64-8.36 |
=31.65-(7.64+8.36) | |
=31.65-16 | |
=15.65 | |
(3)15.18-9.99+1.82 | |
=15.18+1.82-9.99 | |
=17-9.99 | |
=7.01 | (4)8.7+3.92-5.92 |
=8.7-(5.92-3.92)
=8.7-2
=6.7
(5)17.85+3.74-5.56
=21.59-5.56
=16.03
=45.6-4.9
=40.7