题目内容
| 直接写出得数． 5.3+2.5= |
17.6-12.4= | 2.17+0.83= |
| 1-0.64= | 0.325+1.675= | 20.4-2.4= |
| 5.3+0.53= | 4-0.6= | 0.26+0.74= |
| 12.83-0.63= | 3.5+2.2= | 2.7-0.4= |
分析：根据小数加减法的计算方法进行计算．
解答：解：
| 5.3+2.5=7.8 | 17.6-12.4=5.2 | 2.17+0.83=3 |
| 1-0.64=0.36 | 0.325+1.675=2 | 20.4-2.4=18 |
| 5.3+0.53=5.83 | 4-0.6=3.4 | 0.26+0.74=1 |
| 12.83-0.63=12.2 | 3.5+2.2=5.7 | 2.7-0.4=2.3． |
点评：口算时，注意运算符号和数据，然后再进一步计算．
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