Sagot :
Bonsoir
A = (4-6x)² - 5x (2x -7)
A = (16 - 48x + 36x²) - (10x² -35x)
A = 36x² -48x +16 - 10x² +35x
A = 26x² -13 x +16
B = (3x+2)² +(5 -8x) (5+8x)
B = 9x² +12x +4 + (25 -64x²)
B = 9x² +12x +4 +25 -64x²
B = - 55x² +12x +29
C = (4x-5)(-3x+1) - (4x+1)
C = (-12x² +4x +15x -5) - 4x +1
c = -12x² +19x -5 -4x +1
C = -12x² +15x -4
104² = (100 +4)² = 10000 + 800 +16 = 10 816
999 x 1001 = (1 000 -1) ( 1000 +1) = 1000² -1
Je reprends la suite après si tu n'as pas eu de réponses, je suis attendue pour manger, je me fais eng..
A = (4-6x)² - 5x (2x -7)
A = (16 - 48x + 36x²) - (10x² -35x)
A = 36x² -48x +16 - 10x² +35x
A = 26x² -13 x +16
B = (3x+2)² +(5 -8x) (5+8x)
B = 9x² +12x +4 + (25 -64x²)
B = 9x² +12x +4 +25 -64x²
B = - 55x² +12x +29
C = (4x-5)(-3x+1) - (4x+1)
C = (-12x² +4x +15x -5) - 4x +1
c = -12x² +19x -5 -4x +1
C = -12x² +15x -4
104² = (100 +4)² = 10000 + 800 +16 = 10 816
999 x 1001 = (1 000 -1) ( 1000 +1) = 1000² -1
Je reprends la suite après si tu n'as pas eu de réponses, je suis attendue pour manger, je me fais eng..
exercice 1
A = ( 4 - 6x) - 5x(2x-7)
= 4² + 2*4*6x-6x² -5*2x -5x*(-7)
= 16 + 48x - 6x² - 10x - 35
= -19 + 38x - 6x²
B = ( 3x + 2 )² + (5-8x) ( 5+8x)
= 3x² + 2*3x*2 + 2² + 5²-8x²
= 3x² + 12x + 4 + 25 - 8x²
= -5x² + 12x + 29
A = ( 4 - 6x) - 5x(2x-7)
= 4² + 2*4*6x-6x² -5*2x -5x*(-7)
= 16 + 48x - 6x² - 10x - 35
= -19 + 38x - 6x²
B = ( 3x + 2 )² + (5-8x) ( 5+8x)
= 3x² + 2*3x*2 + 2² + 5²-8x²
= 3x² + 12x + 4 + 25 - 8x²
= -5x² + 12x + 29