第二类换元法是一种既重要又不易掌握的积分方法。

The second method of transformation is an important but not-easy-to-master calculus method.

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利用定积分换元公式，可推导出一些非常实用的积分公式。

Several applied integral formula can be deducted from the method.

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我想换2000元。

M:I want to chang for two thousand yuan.

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你给我换五张一元的票子好吗？

Will you change me five one-yuan notes?

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你好。我想换10元的零钱。

Hello, I want to change 10 yuan.

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你有一百元零钱换吗？

Have you got change for a hundred?

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劳驾，你能不能换1元零钱给我?。

Excuse me. Could you give me change for a dollar?

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劳驾，你能不能换1元零钱给我?。

Excuse me. Could you give me change for a dollar?

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