若1<x<4,化简根号(16-8x+x²)-根号(x²-2x+1)

问题描述:

若1<x<4,化简根号(16-8x+x²)-根号(x²-2x+1)

根号(16-8x+x²)-根号(x²-2x+1)
=√﹙4-x)²-√﹙x-1)²
=│4-x│-│x-1│
∵ 1<x<4
∴原式=4-x-(x-1)
=5-2x

根号(16-8x+x²)-根号(x²-2x+1)
=√﹙x-4)²-√﹙x-1)²
=│x-4│-│x-1│
=4-x-(x-1)
=5-2x