问题
计算题
| 用简便方法计算。 |
| (1)12.8－4.9－5.1 | (2)6.75－(0.9＋3.75) |
| (3)1.34＋1.8+3.66＋0.2 | (4)0.96－0.28＋0.04－0.72 |
答案
(1) 12.8-4.9-5.1 | |
| =12.8-(4.9+5.1) | |
| =12.8-10 | |
| =2.8 | (2) 6.75-（0.9+3.75） |
| =6.75-3.75-0.9 | |
| =3-0.9 | |
| =2.1 | |
| (3) 1.34+1.8+3.66+0.2 | |
| =(1.34+3.66)+(1.8+0.2) | |
| =5+2 | |
| =7 | (4) 0.96-0.28+0.04-0.72 |
=0.96+0.04-(0.28+0.72)
=1-1
=0