若向量a,b不共线,向量2a-9b与-ma 2b共线,则实数m的值为,向量2a-9b与-ma+2b共线那么2a-9b=n(-ma+2b)∴2a-9=-mna+2nb∵向量a,b不共线∴-mn=2且2n=9∴n=9/2,∴m=4/9为什么∵向量a,b不共线∴-mn=2且2n=9?
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![若向量a,b不共线,向量2a-9b与-ma 2b共线,则实数m的值为,向量2a-9b与-ma+2b共线那么2a-9b=n(-ma+2b)∴2a-9=-mna+2nb∵向量a,b不共线∴-mn=2且2n=9∴n=9/2,∴m=4/9为什么∵向量a,b不共线∴-mn=2且2n=9?](/uploads/image/z/3849575-23-5.jpg?t=%E8%8B%A5%E5%90%91%E9%87%8Fa%2Cb%E4%B8%8D%E5%85%B1%E7%BA%BF%2C%E5%90%91%E9%87%8F2a-9b%E4%B8%8E-ma+2b%E5%85%B1%E7%BA%BF%2C%E5%88%99%E5%AE%9E%E6%95%B0m%E7%9A%84%E5%80%BC%E4%B8%BA%2C%E5%90%91%E9%87%8F2a-9b%E4%B8%8E-ma%2B2b%E5%85%B1%E7%BA%BF%E9%82%A3%E4%B9%882a-9b%3Dn%28-ma%2B2b%29%E2%88%B42a-9%3D-mna%2B2nb%E2%88%B5%E5%90%91%E9%87%8Fa%2Cb%E4%B8%8D%E5%85%B1%E7%BA%BF%E2%88%B4-mn%3D2%E4%B8%942n%3D9%E2%88%B4n%3D9%2F2%2C%E2%88%B4m%3D4%2F9%E4%B8%BA%E4%BB%80%E4%B9%88%E2%88%B5%E5%90%91%E9%87%8Fa%2Cb%E4%B8%8D%E5%85%B1%E7%BA%BF%E2%88%B4-mn%3D2%E4%B8%942n%3D9%3F)
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