+ √3+ √5+ + √8+ √10+ Bài 2. Cho a = sqrt(4 + sqrt( - Dicamon

Question

+ √3+ √5+ + √8+ √10+ Bài 2. Cho a = sqrt(4 + sqrt(10 + 2sqrt(5))) * b = sqrt(4 - sqrt(10 + 2sqrt(5)))

Answer

b a+b= sqrt 4+ sqrt 10+2 sqrt 5 + sqrt 4- sqrt 10+215; =4+ sqrt 10+25 +4- sqrt 10+25 +2 sqrt (4+ sqrt 10+25 )(4+ sqrt 10+ ( a + ) ² ) 6 + 2sqrt(5) 8+ 2 ( 10 + 872 8 8 + 2 = 8 2 8 +

Answer

(+ b) 4 + +255 + 2 ( a ) 4 - + 255 (1-51)2+8= 2 (1-91)12+8= underline 5m-912+8= underline 512-01-9v(16+8=; 2(1 + sg) = Sn + 9 = 2 - sn + 8 =; b + Gp = a + 0; 9/2+017

rút gọn a và b ạ