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- 3there have been great changes为什么用have been
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- 5He likes the bag because he likes its color.(对话线部分提问)是对because he likes its color.这句划线
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- 7设函数f(x)=(x+1) 2+sinxx 2+1的最大值为M,最小值为m,则M+m= _ .
- 8如图,已知P是△ABC边BC上一点,且PC=2PB,若∠ABC=45°,∠APC=60°,求:∠ACB的大小.
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