Vous pouvez m’aider svp Exercice 4 Développer et réduire les expressions suivantes A = (h - 5)(h+5) B= ( 5m+7)(6m-4) C = (10x - 1)(10 - x) D = (25 + 1)(4+55) E

Bonsoir,

A = (h - 5)(h+5)

= h² +5h -5h -25

= h² -25

B= ( 5m+7)(6m-4)

=  30m² -20m +42m -28

=  30m² +22m -28

C = (10x - 1)(10 - x)

= 100x -10x² -10 +x

= -10x² +101x -10

D = (25 + 1)(4+55)

=  26 * 59 = 1 534

E = (7x - 4) (3x - 9)

= 21x² -63x -12x +36

= 21x² -75x +36

F = (2w + 1) (3w - 4)

= 6w² -8w +3w -4

= 6w² -5w -4

G = (69 - 1)(69 + 1)

= 68* 70 = 4 760

H = (6 - m)(m + 7)

= 6m +42 -m² -7m

= -m² -m +42