bonsoir
C = 3 √2 x √5 x √2 x 4 √ 5
= 3 √2 x √2 x 4 √5 x √5
= 3 √4 x 4 √25
= 6 x 20 = 120
2 √45 / 20 = 2 √9 x √5 / 20
= 6 √5 /20
= 3 √5 /10
(√6 / √3) x √ 2
= ( √6) ( √3) / ( √3)² x √2
= (√18 / 3 ) x √ 2
=(√2 * 9 / 3 ) x √2
= ( 3 √2 /3 ) x √2
= √2 x √2
= 2
