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- 2You can find the post office
- 3若不等式(x-a)*(1-x-a)
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- 5i'm siting in front of the classroom
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- 7Here's the weather report ____ tomorrow.It's going to snow ____ the north and rain in the south.
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- 9已知x-3y=0,且xy≠0,求x2−y2x2−xy+y2的值.
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