若√(x-2)2=2-x,则√x2-6x+9+√x2-8x+16
问题描述:
若√(x-2)2=2-x,则√x2-6x+9+√x2-8x+16
答
2-x≥0,得:x≤2
则:x-3≤0、x-4≤0
√(x²-6x+9)+√(x²-8x+16)
=√(x-3)²+√(x-4)²
=|x-3|+|x-4|
=(3-x)+(4-x)
=7-2x