1、y=-x^2-2ax+3[-5,-2]怎么求值域?2、y=-x^2-2x+3(t≤x≤t=1)怎么求值域?
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1、y=-x^2-2ax+3[-5,-2]怎么求值域?2、y=-x^2-2x+3(t≤x≤t=1)怎么求值域?
![1、y=-x^2-2ax+3[-5,-2]怎么求值域?2、y=-x^2-2x+3(t≤x≤t=1)怎么求值域?](/uploads/image/z/19817409-57-9.jpg?t=1%E3%80%81y%3D-x%5E2-2ax%2B3%5B-5%2C-2%5D%E6%80%8E%E4%B9%88%E6%B1%82%E5%80%BC%E5%9F%9F%3F2%E3%80%81y%3D-x%5E2-2x%2B3%EF%BC%88t%E2%89%A4x%E2%89%A4t%3D1%EF%BC%89%E6%80%8E%E4%B9%88%E6%B1%82%E5%80%BC%E5%9F%9F%3F)
1、y=-x^2-2ax+3
=(x-a)^2+3-a^a
当a>-2时,值域为[4a+7,10a+28]
当a
=(x-a)^2+3-a^a
当a>-2时,值域为[4a+7,10a+28]
当a