bjr
ex 2
A = 4 (2x+3) = 4*2x + 4*3 = 8x + 12
B = 5x (2x-3) = 5x*2x + 5x*(-3) = 10x² - 15x
C = (3x+2) (5-2x) = 3x*5 + 3x*(-2x) + 2*5 + 2*(-2x)
= 15x - 6x² + 10 - 4x = -6x² + 11x + 10
ex 1
supprime les ( )
A = 5x² - 5x + 3 - 3x² + x + 7
A = 2x² - 4x + 10
B - tu te réfères au 2
C - si x = 3
alors C = 2*(3)² - 4*3 + 10 = 2*9 - 12 + 10 = 18 - 12 + 10 = 16
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bjr
ex 2
A = 4 (2x+3) = 4*2x + 4*3 = 8x + 12
B = 5x (2x-3) = 5x*2x + 5x*(-3) = 10x² - 15x
C = (3x+2) (5-2x) = 3x*5 + 3x*(-2x) + 2*5 + 2*(-2x)
= 15x - 6x² + 10 - 4x = -6x² + 11x + 10
ex 1
supprime les ( )
A = 5x² - 5x + 3 - 3x² + x + 7
A = 2x² - 4x + 10
B - tu te réfères au 2
C - si x = 3
alors C = 2*(3)² - 4*3 + 10 = 2*9 - 12 + 10 = 18 - 12 + 10 = 16