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- 1如图,梯形ABCD中,AD∥BC,AB=CD=AD=1,∠B=60°,直线MN是梯形的对称轴,P为直线MN上的一动点,则PC+PD的最小值为( ) A.1 B.2 C.3 D.2
- 2已知a、b满足a+b=3,ab=2,则a2+b2=_.
- 3有一筐鸡蛋,当两个两个取、三个三个取、四个四个取、五个五个取时,筐内最后都是剩一个鸡蛋;当七个七个取出时,筐里最后一个也不剩.已知筐里的鸡蛋不足400个,那么筐内原来共有_
- 4以走过为话题写作文、、、700字左右
- 5为什么冷水滴在烧红的炉盖上会发出滋滋的声音?
- 6no,she didn't leave china last year.she travelled to the USA in 2009强调in 2009
- 7∠AOB内有射线OC,OD,∠AOD=36度,∠COB=45度,且∠AOC=3/4∠DOB,求∠AOB的度数?
- 8They are talking to their plans for the summer holiday改错~
- 9she is too afraid to know ___ to do.A how B what C whether D that
- 10Don’t mention