如图,线段ac,b为ac上一点,m,n分别是ac,bc的中点.1>若ab=12cm,求mn的chang如图,线段AC,B为AC上一点,M,N分别是AC,BC的中点.(1)若AB=12cm,求MN的长.(2)若AB=acm,其他条件不变,求MN的长.(3)请写出从(1),(2
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![如图,线段ac,b为ac上一点,m,n分别是ac,bc的中点.1>若ab=12cm,求mn的chang如图,线段AC,B为AC上一点,M,N分别是AC,BC的中点.(1)若AB=12cm,求MN的长.(2)若AB=acm,其他条件不变,求MN的长.(3)请写出从(1),(2](/uploads/image/z/7663853-29-3.jpg?t=%E5%A6%82%E5%9B%BE%2C%E7%BA%BF%E6%AE%B5ac%2Cb%E4%B8%BAac%E4%B8%8A%E4%B8%80%E7%82%B9%2Cm%2Cn%E5%88%86%E5%88%AB%E6%98%AFac%2Cbc%E7%9A%84%E4%B8%AD%E7%82%B9.1%3E%E8%8B%A5ab%3D12cm%2C%E6%B1%82mn%E7%9A%84chang%E5%A6%82%E5%9B%BE%2C%E7%BA%BF%E6%AE%B5AC%2CB%E4%B8%BAAC%E4%B8%8A%E4%B8%80%E7%82%B9%2CM%2CN%E5%88%86%E5%88%AB%E6%98%AFAC%2CBC%E7%9A%84%E4%B8%AD%E7%82%B9.%281%29%E8%8B%A5AB%3D12cm%2C%E6%B1%82MN%E7%9A%84%E9%95%BF.%EF%BC%882%EF%BC%89%E8%8B%A5AB%3Dacm%2C%E5%85%B6%E4%BB%96%E6%9D%A1%E4%BB%B6%E4%B8%8D%E5%8F%98%2C%E6%B1%82MN%E7%9A%84%E9%95%BF.%EF%BC%883%EF%BC%89%E8%AF%B7%E5%86%99%E5%87%BA%E4%BB%8E%EF%BC%881%EF%BC%89%2C%EF%BC%882)
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