Bonjour, j’ai un exo sur les identités remarquables, peut ton m’aider ?

Bonjour

A =51^2

A = (50+ 1)^2 = 50^2  + 2(50x1) + 1^2

A = 2500 + 100 * 1 = 2601

B = 1005^2

B = (1000+5)^2

B = 1000^2 + 2(1000x5) + 5^2

B =  1 000 000 + 10 000 + 25

B = 1 010 025

C = 201^2

C = (200+1)^2

C = 200^2 + 2(200x1) + 1^2

C = 40 000 + 400 + 1

C = 40 401

D = 109^2

D = (100+9)^2

D = 100^2 + 2(100x9) + 9^2

D = 10 000 + 1800 + 81

D = 11 881

Bonsoir,

A =51²

A= 50²+1²

A= (50+1)²

A= (50 +1)(50 + 1)

A= 2 500+100+1

A=2 601

B = 1005²

B= 1000²+5²

B = (1000+5)²

B= (1 000+5)(1 000+5)

B =  1 000 000 + 10 000 + 25

B= 1 010 025

C = 201²

C = (200+1)²

C= (200+1)(200+1)

C = 40 000 + 400 + 1

C = 40 401

D = 109²

D= 100² + 9²

D = (100+9)²

D= (100+9)(100+9)

D = 10 000+900+900+81

D = 11 881