函数y=4^x-3.2^x+3的值域为【1,7】则函数的定义域为?标准答案是负无穷大到0交1到2.都是闭区间我的解法:设2^x=t,t>0y=t^2-3t+3 当y=1时,t=2或1 ,当y=7时t=4或-1 (-1舍去)因为y的对成轴是3/2 取t=1时还有
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![函数y=4^x-3.2^x+3的值域为【1,7】则函数的定义域为?标准答案是负无穷大到0交1到2.都是闭区间我的解法:设2^x=t,t>0y=t^2-3t+3 当y=1时,t=2或1 ,当y=7时t=4或-1 (-1舍去)因为y的对成轴是3/2 取t=1时还有](/uploads/image/z/7252103-47-3.jpg?t=%E5%87%BD%E6%95%B0y%3D4%5Ex-3.2%5Ex%2B3%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BA%E3%80%901%2C7%E3%80%91%E5%88%99%E5%87%BD%E6%95%B0%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E4%B8%BA%3F%E6%A0%87%E5%87%86%E7%AD%94%E6%A1%88%E6%98%AF%E8%B4%9F%E6%97%A0%E7%A9%B7%E5%A4%A7%E5%88%B00%E4%BA%A41%E5%88%B02.%E9%83%BD%E6%98%AF%E9%97%AD%E5%8C%BA%E9%97%B4%E6%88%91%E7%9A%84%E8%A7%A3%E6%B3%95%EF%BC%9A%E8%AE%BE2%5Ex%3Dt%2Ct%3E0y%3Dt%5E2-3t%2B3+%E5%BD%93y%3D1%E6%97%B6%2Ct%3D2%E6%88%961+%2C%E5%BD%93y%3D7%E6%97%B6t%3D4%E6%88%96-1+%28-1%E8%88%8D%E5%8E%BB%EF%BC%89%E5%9B%A0%E4%B8%BAy%E7%9A%84%E5%AF%B9%E6%88%90%E8%BD%B4%E6%98%AF3%2F2+%E5%8F%96t%3D1%E6%97%B6%E8%BF%98%E6%9C%89)
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