化简:根号20-根号5=
问题描述:
化简:根号20-根号5=
答
解
√20-√5
=√4×5-√5
=2√5-√5
=√5
化简:根号20-根号5=
解
√20-√5
=√4×5-√5
=2√5-√5
=√5