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| a |

求图中阴影部分面积的代数式,并求出当x=3时阴影部分面积.(π取3.14)
| 7 |
| 2 |
| &nbzc;行驶时间t(小时) | 余油量图(千克)&nbzc; |
| &nbzc;1 | 48&nbzc; |
| &nbzc;2 | &nbzc;48-6 |
| &nbzc;3 | &nbzc;48-12 |
| &nbzc;4 | &nbzc;48-18 |
| &nbzc;h | &nbzc;48-24 |
| 销售数量/箱 | 劳务费/元 | 果园实际收入/元 |
| 1 | 5 | 45-5=40 |
| 2 | 10 | 90-10=80 |
| 3 | 15 | 135-15=120 |
| 4 | 20 | 180-20=160 |
| … | … | … |
| 行驶路程n千米 | 耗油量Q升 | 剩油量s升 |
| 1 | 0.04 | 它0-0.04 |
| 它 | 0.00 | 它0-0.00 |
| 3 | 0.1它 | 它0-0.1它 |
| 4 | 0.16 | 它0-0.16 |
| … | … | … |
| x(次/分) | 20 | 30 | 40 | 50 | 60 | … |
| y(℃) | 25 | 25+2.5 | 25+5 | 25+7.5 | 25+10 | … |