已知3x²-x=-2,则代数式5-6x²+2x的值是____(我只要具体过程+解析)①还有一道已知点O在直线AB上,且线段OA的长为6cm,线段OB的长为8cm,E,F分别为线段OA,OB的中点,则线段EF的长为______②26辆车拍
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![已知3x²-x=-2,则代数式5-6x²+2x的值是____(我只要具体过程+解析)①还有一道已知点O在直线AB上,且线段OA的长为6cm,线段OB的长为8cm,E,F分别为线段OA,OB的中点,则线段EF的长为______②26辆车拍](/uploads/image/z/2550535-7-5.jpg?t=%E5%B7%B2%E7%9F%A53x%26%23178%3B-x%3D-2%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8F5-6x%26%23178%3B%2B2x%E7%9A%84%E5%80%BC%E6%98%AF____%EF%BC%88%E6%88%91%E5%8F%AA%E8%A6%81%E5%85%B7%E4%BD%93%E8%BF%87%E7%A8%8B%2B%E8%A7%A3%E6%9E%90%EF%BC%89%E2%91%A0%E8%BF%98%E6%9C%89%E4%B8%80%E9%81%93%E5%B7%B2%E7%9F%A5%E7%82%B9O%E5%9C%A8%E7%9B%B4%E7%BA%BFAB%E4%B8%8A%2C%E4%B8%94%E7%BA%BF%E6%AE%B5OA%E7%9A%84%E9%95%BF%E4%B8%BA6cm%2C%E7%BA%BF%E6%AE%B5OB%E7%9A%84%E9%95%BF%E4%B8%BA8cm%2CE%2CF%E5%88%86%E5%88%AB%E4%B8%BA%E7%BA%BF%E6%AE%B5OA%2COB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%88%99%E7%BA%BF%E6%AE%B5EF%E7%9A%84%E9%95%BF%E4%B8%BA______%E2%91%A126%E8%BE%86%E8%BD%A6%E6%8B%8D)
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