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- 2如图,已知点F是△ABC的边BC的延长线上的一点,DF⊥AB于D,交AC于E,且∠A=56°,∠F=31°,求∠ACB的度数.
- 3求微分方程dy/dx=y^2/(-x+2xy+y^2)的通解
- 4I want to go somewhere in (east) China this winter.
- 5she wanted to sat down because she was tired
- 6y=[(x^2) -2x +1]^10 求函数导数
- 7l do my homework at six-thirty,and then l eat breakfast at around seven-thirty.
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