1 câu trả lời
(2 √2- √5+ √18). √5+20 √1/10
= (2√2- √5 + √9.2)√5 + 20. $\frac{√1}{10}$
= (2√2- √5 + 3√2)√5 + 20. $\frac{1}{10}$
= (5√2 - √5)√5 + 2
= 5√10 - 5 + 2
= 5√10 -3
(2 √2- √5+ √18). √5+20 √1/10
= (2√2- √5 + √9.2)√5 + 20. $\frac{√1}{10}$
= (2√2- √5 + 3√2)√5 + 20. $\frac{1}{10}$
= (5√2 - √5)√5 + 2
= 5√10 - 5 + 2
= 5√10 -3