△=(m-2)²-4(0.5m-2) =m²-4m+4-2m+8 =m²-6m+12你怎么算出来的
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![△=(m-2)²-4(0.5m-2) =m²-4m+4-2m+8 =m²-6m+12你怎么算出来的](/uploads/image/z/3815421-69-1.jpg?t=%E2%96%B3%3D%28m-2%29%26%23178%3B-4%280.5m-2%29+%3Dm%26%23178%3B-4m%2B4-2m%2B8+%3Dm%26%23178%3B-6m%2B12%E4%BD%A0%E6%80%8E%E4%B9%88%E7%AE%97%E5%87%BA%E6%9D%A5%E7%9A%84)
△=(m-2)²-4(0.5m-2) =m²-4m+4-2m+8 =m²-6m+12你怎么算出来的
△=(m-2)²-4(0.5m-2) =m²-4m+4-2m+8 =m²-6m+12你怎么算出来的
△=(m-2)²-4(0.5m-2) =m²-4m+4-2m+8 =m²-6m+12你怎么算出来的
哪里不懂
a=1,b=m-2,c=0.5m-2
所以△=b²-4ac=(m-2)²-4(0.5m-2)
后面会了吧