bonjour,
exercice 1
a = 12- 3 = 9
b= 30 -12 = 18
c= 52 - 30 +10 = 32
d= 7* 5 = 35
e= 20 -8 = 12
f= 4* (3-3) +4 = 4*0 +4 = 4
g= [3+ 2(4)] * 3 -10=
(3+ 8 )*3 -10=
11*3 -10 = 33-10 = 23
Exercice 2
1)
5,5 + 1,5 = 7
Rectangle moins partie blanche
2)
1: (3* 7) = 21 = gd rectangle complet
Partie blanche : ( 1,5*2) = 3
Aire hachurée: 21-3 = 18cm²
2: (3* 7) -( 1,5*2)= 18cm²
