函数y=-x+2x-3的值域为( ) A(-∞,4] B(-∞,-2]函数y=-x+2x-3的值域为( )A(-∞,4] B(-∞,-2] C[4,+∞) D(-∞,4]
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![函数y=-x+2x-3的值域为( ) A(-∞,4] B(-∞,-2]函数y=-x+2x-3的值域为( )A(-∞,4] B(-∞,-2] C[4,+∞) D(-∞,4]](/uploads/image/z/11293330-58-0.jpg?t=%E5%87%BD%E6%95%B0y%3D-x%2B2x%EF%BC%8D3%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BA%EF%BC%88+%EF%BC%89+A%EF%BC%88-%E2%88%9E%2C4%5D+B%EF%BC%88-%E2%88%9E%2C-2%5D%E5%87%BD%E6%95%B0y%3D-x%2B2x%EF%BC%8D3%E7%9A%84%E5%80%BC%E5%9F%9F%E4%B8%BA%EF%BC%88+%EF%BC%89A%EF%BC%88-%E2%88%9E%2C4%5D+B%EF%BC%88-%E2%88%9E%2C-2%5D+C%5B4%2C%2B%E2%88%9E%EF%BC%89+D%EF%BC%88-%E2%88%9E%2C4%5D)
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函数y=-x+2x-3的值域为( ) A(-∞,4] B(-∞,-2]函数y=-x+2x-3的值域为( )A(-∞,4] B(-∞,-2] C[4,+∞) D(-∞,4]
函数y=-x+2x-3的值域为( ) A(-∞,4] B(-∞,-2]
函数y=-x+2x-3的值域为( )
A(-∞,4] B(-∞,-2] C[4,+∞) D(-∞,4]
函数y=-x+2x-3的值域为( ) A(-∞,4] B(-∞,-2]函数y=-x+2x-3的值域为( )A(-∞,4] B(-∞,-2] C[4,+∞) D(-∞,4]
二次函数y=-x^2+2x-3=-(x+1)^2-2;
故函数的值域为(-∞,-2] ;选择B
B