(√45-√5)2/20=(3√5-√5)2/20=(4*5)/20=20/20=1
√45 - √5 = √ 9 * √ 5 - √5 = 3 √5 - √5 = 2√5
(2√5) ² = 4 * 5 = 20
20 : 20 = 1
(√45-√5)2/20=(3√5-√5)2/20=(4*5)/20=20/20=1
√45 - √5 = √ 9 * √ 5 - √5 = 3 √5 - √5 = 2√5
(2√5) ² = 4 * 5 = 20
20 : 20 = 1