√50-﹙1/√5-√45+2√20
问题描述:
√50-﹙1/√5-√45+2√20
答
后面少个括号吧
√50-﹙1/√5-√45+2√20)
=5√2-(√5/5-3√5+4√5)
=5√2-(6/5)√5