| What is the differential equation？ |
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| 引用本文： | 桨宇学.What is the differential equation？[J].中学生数学,2014(7):47-48. |
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| 作者姓名： | 桨宇学 |
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| 作者单位： | 首都师范大学附属中学,100048 |
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| 摘 要： | An equation involving a derivative is called a differential equation.Such as,dy/dx=2x,and the function y=f（x）satisfies this equation.When we know the additional condition that y=2 when x=-1,the function y=f（x）will be find exactly.The additional condition is called the initial condition.It is used to evaluate constant of integration.
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| 关 键 词： | 中学 英语 课外阅读 阅读材料 |
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