Answered

Bonjour excusez-moi de vous déranger mais j’ai vraiment besoin d’aide

Soit y un nombre relatif.
Développe et réduis les expressions suivantes.

a) A= 7(2x+3) - 4 (3 - 4y)……………

b) B= 4sur3 ( -6x + 1sur2 ) - 1sur3 (-3x -1)…………

c)C= 2x(3x-5)…………..

d)D= (2x+3)(3x+4)…….

Sagot :

Pinaveil

Bonjour,

a) A = 7(2x+3)-4(3-4y)

A = 14x+21-12+16y

A = 14x+9+16y

b) B = 4/3(-6x+1/2)-1/3(-3x-1)

B = -8x+2/3+x+1/3

B = -7x+1

c) C = 2x(3x-5)

C = 2x×3x-2x×5

C = 6x²-10x

d) D = (2x+3)(3x+4)

D = 2x×3x+2x×4+3×3x+3×4

D = 6x²+8x+9x+12

D = 6x²+17x+12

ephtamina890

7(2x+3)-4(3-4y)

=(7×2x)+(7×3)-(4×3)+(4×4y)

=14x+21-12+16y

=16y+14x+9

4/3(-6x+1/2)-1/3(-3x-1)

=-(4/3×6x)+(4/3×1/2)+(1/3×3x)+(1/3×1)

=-8x+2/3+x+1/3

=-7x+1

2x(3x-5)

=(2x×3x)-(2x×5)

=6x^2-10x

(2x+3)(3x+4)

=(2x×3x)+(2x×4)+(3×3x)+(3×4)

=6x^2+8x+9x+12

=6x^2+17x+12