Bonsoir,
A=-4√32 - 2√8 + 5√18 = -4√(2*16) - 2√(2*4) + 5√(2*9)
A = -4*4√2 - 2*2√2 + 5*3 √2 = (-16 -4 + 5) √2
A = -15√2
B=√40 x √90 x √160 = √(4 * 10 * 9 * 10 * 16 * 10) = 2 * 10 * 3 * 4 √10
B = 240√10
C = (4√5 +2√6)² = 16 * 5 + 4 * 6 + 2 * 4 * 2 √30 = 80 + 24 + 16 √30
C = 104 + 16√30
D = (4√3+3√5)² = 16 * 3 + 9 * 5 + 2 * 4 * 3 √15
D = 93 + 24√15
E = (2+4√3)(2-4√3) = 2² - (4√3)² = 4 - 16*3
E = 44
F = 27 √8 / 6√18 = 27 * 2√2 / (6 * 3√2) = 54/18
F = 3
