1、若等腰梯形有一个底角是120度,腰长为3,一底长4,则它的另一个底长为____2、在梯形ABCD中,AD//BC,若角B+角C=90度,AD=4,BC=10,M为AD边的中点,N为BC边的中点,则MN的长为____
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![1、若等腰梯形有一个底角是120度,腰长为3,一底长4,则它的另一个底长为____2、在梯形ABCD中,AD//BC,若角B+角C=90度,AD=4,BC=10,M为AD边的中点,N为BC边的中点,则MN的长为____](/uploads/image/z/5926852-28-2.jpg?t=1%E3%80%81%E8%8B%A5%E7%AD%89%E8%85%B0%E6%A2%AF%E5%BD%A2%E6%9C%89%E4%B8%80%E4%B8%AA%E5%BA%95%E8%A7%92%E6%98%AF120%E5%BA%A6%2C%E8%85%B0%E9%95%BF%E4%B8%BA3%2C%E4%B8%80%E5%BA%95%E9%95%BF4%2C%E5%88%99%E5%AE%83%E7%9A%84%E5%8F%A6%E4%B8%80%E4%B8%AA%E5%BA%95%E9%95%BF%E4%B8%BA____2%E3%80%81%E5%9C%A8%E6%A2%AF%E5%BD%A2ABCD%E4%B8%AD%2CAD%2F%2FBC%2C%E8%8B%A5%E8%A7%92B%2B%E8%A7%92C%3D90%E5%BA%A6%2CAD%3D4%2CBC%3D10%2CM%E4%B8%BAAD%E8%BE%B9%E7%9A%84%E4%B8%AD%E7%82%B9%2CN%E4%B8%BABC%E8%BE%B9%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%88%99MN%E7%9A%84%E9%95%BF%E4%B8%BA____)
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