函数y=(1/2)^√-x^2+2x+3,定义域 x属于[-1,3],此时令t=-x^2+2x+3则t属于__.u=√t,则u属于__.则y=(1/2)^u属于__.x属于[1,3]时,t=-x^2+2x+3单调递__.y=(1/2)^u在R上单调递__.∴f(x)单调递__
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![函数y=(1/2)^√-x^2+2x+3,定义域 x属于[-1,3],此时令t=-x^2+2x+3则t属于__.u=√t,则u属于__.则y=(1/2)^u属于__.x属于[1,3]时,t=-x^2+2x+3单调递__.y=(1/2)^u在R上单调递__.∴f(x)单调递__](/uploads/image/z/13566296-56-6.jpg?t=%E5%87%BD%E6%95%B0y%3D%EF%BC%881%2F2%EF%BC%89%5E%E2%88%9A-x%5E2%2B2x%2B3%2C%E5%AE%9A%E4%B9%89%E5%9F%9F+x%E5%B1%9E%E4%BA%8E%5B-1%2C3%5D%2C%E6%AD%A4%E6%97%B6%E4%BB%A4t%3D-x%5E2%2B2x%2B3%E5%88%99t%E5%B1%9E%E4%BA%8E%EF%BC%BF%EF%BC%BF.u%3D%E2%88%9At%2C%E5%88%99u%E5%B1%9E%E4%BA%8E%EF%BC%BF%EF%BC%BF.%E5%88%99y%3D%EF%BC%881%2F2%EF%BC%89%5Eu%E5%B1%9E%E4%BA%8E%EF%BC%BF%EF%BC%BF.x%E5%B1%9E%E4%BA%8E%5B1%2C3%5D%E6%97%B6%2Ct%3D-x%5E2%2B2x%2B3%E5%8D%95%E8%B0%83%E9%80%92%EF%BC%BF%EF%BC%BF.y%3D%EF%BC%881%2F2%EF%BC%89%5Eu%E5%9C%A8R%E4%B8%8A%E5%8D%95%E8%B0%83%E9%80%92%EF%BC%BF%EF%BC%BF.%E2%88%B4f%EF%BC%88x%EF%BC%89%E5%8D%95%E8%B0%83%E9%80%92%EF%BC%BF%EF%BC%BF)
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