bonjour,
ex 1 :
A = -16x²+20
B = x²-6x-7
C = 2x²+13x+15
D = -3x²+4
ex 2 :
tu prends ta calculatrice,
ts les résultats = 1
b) x²-(x²-1) = x²-(x²-1)= 1
c) 625- 26*24 = x²-(x²-1) = 1
625 = 25²
25²-(25+1)(25-1) =
625-(625-1) = 1
ex 3 :
aCr = CA/CR
cos67 = CA/8
0,3907 = CA/8
CA = 3,13cm
coseDf = DF/DF
= 8,6/10,6 = 0,8113
eDf = 36°
tu fais un autre mess pour le 4)
