题目内容
| 口算． 4.5+5.5 |
680+340 | 487+399 | 1-0.25 |
| 1200-700 | 5-0.8-1.2 | 90×300 | 7.4×100 |
| 4×（25×7） | 720÷60 | 1.27+0.73 | 120÷24 |
| 340-190 | 225-99 | 810÷27 | 3.9+2.03 |
| 1-0.2 | 50×13 | 23×4+27×4 | 8.2+0.54+0.46． |
分析：根据整数、小数的加减乘除的计算方法进行计算即可．
解答：
| 解：4.5+5.5=10 | 680+340=1020 | 487+399=886 | 1-0.25=0.75 |
| 1200-700=500 | 5-0.8-1.2=3 | 90×300=27000 | 7.4×100=740 |
| 4×（25×7）=700 | 720÷60=12 | 1.27+0.73=2 | 120÷24=5 |
| 340-190=150 | 225-99=126 | 810÷27=30 | 3.9+2.03=5.93 |
| 1-0.2=0.8 | 50×13=650 | 23×4+27×4=200 | 8.2+0.54+0.46=9.2 |
点评：本题主要考查整数、小数的口算，看清数据和运算符号进行计算即可；能简算的要简算．
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