设f(x)=x+2,x≤1.x²,-1<x<2.2x,x≥2若f(x)=3,则x=_______
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![设f(x)=x+2,x≤1.x²,-1<x<2.2x,x≥2若f(x)=3,则x=_______](/uploads/image/z/3878051-59-1.jpg?t=%E8%AE%BEf%EF%BC%88x%EF%BC%89%3Dx%2B2%2Cx%E2%89%A41.x%26%23178%3B%2C-1%EF%BC%9Cx%EF%BC%9C2.2x%2Cx%E2%89%A52%E8%8B%A5f%EF%BC%88x%EF%BC%89%3D3%2C%E5%88%99x%3D_______)
设f(x)=x+2,x≤1.x²,-1<x<2.2x,x≥2若f(x)=3,则x=_______
设f(x)=x+2,x≤1.x²,-1<x<2.2x,x≥2
若f(x)=3,则x=_______
设f(x)=x+2,x≤1.x²,-1<x<2.2x,x≥2若f(x)=3,则x=_______
当x≤1
x+2=3
x=1
当-1<x<2
x^2=3
x=√3
当x≥2
2x=3
x=3/2(舍去)
所以x=1,√3
x=1或x=根下3