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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.
youdao
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你好。我想换10元的零钱。
Hello, I want to change 10 yuan.
youdao
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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?
youdao
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你有一百元零钱换吗？
Have you got change for a hundred?
youdao
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你有一百元零钱换吗？
Have you got change for a hundred?
youdao