Bonsoir, aidez moi SVP Pour les 3 excercices

soit x = BC
AC^2 = ×^2 + 5
EC^2 = AC^2 + AE^2 => 4.6 =X^2 + 5 + 3 => x^2 = 24 - 8 = 16 => × = 4 donc BC = 4 entier
aire rectangle EGCA = AC.EA = V21 . V3 = 3V7
ex 88
a) 26,5 ; b) V2/3 c) 6,1 d) 7/3 e) 9x2 = 18 f) 4/5 g) 3x7 = 21 h) 2V10/V10 = 2

ex 89
a) V36xV5 = 6V5 b) V(2x3x2x7x7) = 2×7V3 =14V3 c) 5V2/V2 = 5 d) V(3.2)/3V2 = V3/3