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- 1如图矩形ABCD中,延长CB到E,使CE=AC,F是AE中点.求证:BF⊥DF.
- 2甲数是乙数的3分之2,乙数是丙数的5分之4,求甲·乙·丙三数的比
- 3函数y=log1/2(3x2−ax+5)在[-1,+∞)上是减函数,则实数a的取值范围是_.
- 4如图,△ABC中,AB=AC,D为BC上一点,DE⊥AB于点E,DF⊥BC,交AC于点F,∠A=56°,求∠EDF的度数.
- 5英语翻译
- 6when you are down,and the world seems dark and
- 7一件商品,先提价25%,以后再降价25%,现在的价格和原来对比( ) A.提好了 B.降低了 C.不变 D.无法确定
- 8电机线圈电阻测量
- 9英语小作文 :my favorite book/idol/film.
- 10what kind of noodles would he likes?哪错了 Do you like noodles or dumpling?