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Sagot :

bonjour,

exo 1:

A=3(4x+7) +4(2x-9)

A=3×4x+3×7+4×2x+4×(-9)

A= 12x+21+8x-36

A= 20x-15

B=7x(2x-5) -x(2x-5)

B=7x×2x+7x×(-5) -x×2x-x×(-5)

B= 14x²-35x-2x²+5x

B= 12x²-30x

C=(2x+5) (3x+7)

C= 2x×3x+2x×7+5×3x+5×7

C= 6x²+14x+15x+35

C= 6x²+29x+35

D=(2x-5) (3x-2)

D= 2x×3x+2x×(-2) -5×3x-5×(-2)

D= 6x²-4x-15x+10

D= 6x²-19x+10

exo 2:

E=(2x+3) (5x-8) -(2x-4) (5x-1)

E= 2x×5x+2x×(-8) +3×5x+3×(-8) -2x×5x-2x×(-1) -4×5x-4×(-1)

E= 10x²-16x+15x-24-10x²+2x-20x+4

E= -19x-20

F=(5x-2) (5x-8) -(3x-5) (x+7)

F= 5x×5x+5x×(-8) -2×5x-2×(-8) -3x×x-3x×7-5×x-5×7

F= 25x²-40x-10x+16-3x²-21x-5x-35

F= 22x²-76x-19

G=2(x+7) (3-2x) +(5x-2) (4x+1)

G= 2× x×3+x×(-2x) +7×3+7×(-2x) +5x×4x+5x×1-2×4x-2×1

G= 6x-2x²+21-14x+20x²+5x-8x-2

G= 18x²-11x+19

exo 3:

H= (x+5) ²

H= x²+2×x×5+5²

H= x²+10x+25

I=(4x+6) ²

I= (4x) ²+2×4x×6+6²

I= 16x² +48x+36

J=(x-5) ²

J= x²-2×x×5+5²

J= x²-10x+25

K=(3x-7) ²

K= (3x) ²-2×3x×7+7²

K= 9x²-42x+49

L= (y+3) (y-3)

L= y²-3²

L= y²-9

M=(2x+5) (2x-5)

M= (2x) ²-5²

M= 4x²-25

voilà je n'ai pas le temps de faire la suite mais j'espère t'avoir aidé

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