Bonjour,
A = (32+2)²
= 34 ² = 34*34 =1 156
B= (22-1)²
21² = 21*21 = 441
C= (4r - 5) (42 + 5)
168r +20r -210 -25
= 188r -235
Bonjour,
Développer :
A = (32+2)²
A = 34²
A = 1 156
B = (22-1)²
B = 21²
B = 441
C = (4r-5)(42+5)
C = (4r-5)*47
C = 188r-235
Bonne journée.