计算:根号8+4根号5-4根号2+根号45
问题描述:
计算:根号8+4根号5-4根号2+根号45
答
根号8+4根号5-4根号2+根号45
=2根号2+4根号5-4根号2+3根号5
=7根号5-2根号2