x>3,化简根号x²-6x+9+根号x²+2x+1
问题描述:
x>3,化简根号x²-6x+9+根号x²+2x+1
答
根号x²-6x+9+根号x²+2x+1
=根号(x-3)²+根号(x+1)²
=x-3+x+1
=2x-2