先将√(x^2-8x+16)+ √(x^2-6x+9)化简
否则直接代入数字会很难计算
√(x^2-8x+16)+ √(x^2－6x+9)
=√(x-4)^2+ √(x-3)^2
=(x-4)+(x-3)
=2x-7
把x=√10代入2x-7
2x-7
=2×√10+7
=2√10+7
好好学习哦