Question

Упростить выражение (3√5-√20)√5.

Answer 1

3√25-√100=3*5-10=15-10=5

Answer 2

$(3sqrt{5}-sqrt{20})sqrt{5}=(3sqrt{5}-sqrt{4*5})sqrt{5}=(3sqrt{5}-sqrt{4}sqrt{5})sqrt{5}=\=(3sqrt{5}-2sqrt{5})sqrt{5}=sqrt{5}*sqrt{5}=sqrt{25}=5$