Opérations sur les puissances

(-1/2)2 = (-1/2) x (-1/2) = 1/4
A = 5 x (3/2)2 -7 x (5/4) + 2 =


B = 5/6 - (1/2)2 x (2/3) =


C = -2 x (-3/4)2+ 5x(-3/4) + 2 =


D = a2 - b 2 (pour a = 1/6 et b = 2/3) =


E = x2+5x -7 (pour x = 7/3) =


F = -25x2-5x +13 (pour x = 2/5) =


G = 3a2 - 2a +1 (pour a = 1/2) =


H = (-5/2)a2 - a/3 +2 (pour a = 1/4) =

Exercice 7 :
Complète les cases vides :
325 = 38x 3
2,5 x 2,53 = 2,57
0.4 x 0,4 = 0,42
a x an x a = an+3
(-3)5 x (-3) = (-3)-2
(-0,5) x (-0,5)-7 = (-0,5)-1