Bonjour
Supprimer les parenthèses et réduire :
A = 7y - (3y - 5)
A = 7y - 3y + 5
A = 4y + 5
B = 4x + (-5x + 7)
B = 4x - 5x + 7
B = - x + 7
C = -4x² - (-7 + 4x) + (7x² - 3x)
C = - 4x² + 7 - 4x + 7x² - 3x
C = 3x² - 7x + 7
D = -(7a - 5) + (3a - 4 + 5a²)
D = - 7a + 5 + 3a - 4 + 5a²
D = 5a² - 4a + 1.
bonjour
signe "-" devant (3y - 5) .. on change le3y en -3y et -5 en +5
A=7y-3y+5=4y+5
signe + devant (-5x + 7) , tu recopis
B=4x-5x+7= -x+7
= -4x²+7-4x+7x²-3x= -4x²+7x²-4x-3x+7=3x²-7x+7
D = -(7a - 5) + (3a - 4 + 5a²) = -7a+5+3a-4+5a²=5a²-4a+1
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Verified answer
Bonjour
Supprimer les parenthèses et réduire :
A = 7y - (3y - 5)
A = 7y - 3y + 5
A = 4y + 5
B = 4x + (-5x + 7)
B = 4x - 5x + 7
B = - x + 7
C = -4x² - (-7 + 4x) + (7x² - 3x)
C = - 4x² + 7 - 4x + 7x² - 3x
C = 3x² - 7x + 7
D = -(7a - 5) + (3a - 4 + 5a²)
D = - 7a + 5 + 3a - 4 + 5a²
D = 5a² - 4a + 1.
Verified answer
bonjour
A = 7y - (3y - 5)
signe "-" devant (3y - 5) .. on change le3y en -3y et -5 en +5
A=7y-3y+5=4y+5
B = 4x + (-5x + 7)
signe + devant (-5x + 7) , tu recopis
B=4x-5x+7= -x+7
C = -4x² - (-7 + 4x) + (7x² - 3x)
= -4x²+7-4x+7x²-3x= -4x²+7x²-4x-3x+7=3x²-7x+7
D = -(7a - 5) + (3a - 4 + 5a²) = -7a+5+3a-4+5a²=5a²-4a+1