问题
计算题
脱式计算。（能简算的要简算）
|
答案
（1）（ 9.25+ 0.3×33-1.99）÷2.5 | |
| =（9.25+9.9-1.99）÷2.5 | |
| =17.16÷2.5 | |
| =6.864 | （2）（5.7×1.2+1.2×4.3）×2.5 |
| =（5.7+4.3）×1.2×2.5 | |
| =10×1.2×2.5 | |
| =30 | |
| （3）（2.87×9.4-9.4×1.87）×0.13 | |
| =（2.87-1.87）×9.4×0.13 | |
| =1×9.4×0.13 | |
| =1.222 | （4）[2.9-1.8÷（ 4.8-3.9）]×3 |
=[2.9-1.8÷0.9]×3
= （ 2.9-2）×3
= 2.7