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Sarah349
@Sarah349
April 2019
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Développer chaque expression
A=3a(×-2)
B=×(2-5×)
C=-3/2(×-6)
D=-5/7a(3-7/4a)
Merci à celui qui pourra me répondre :-)
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Je note * pour multiplier
A=3a(×-2)
= 3a*x - 3a * -2
=3ax -6a
B=×(2-5×)
= x*2 -x*5x
=2x -5x²
C=-3/2(×-6)
=(-3/2)*× -(3/2)* -6 (car 3*6/2 = 9 et - par - ça fait + )
= -3x /2 + 9
D=(-5/7) a (3 - (7/4) a )
est ce que c'est bien la fraction -(5/7) et ensuite la fraction (7/4)
= -5*a *3 /7 + 5*7 a/28
= -15a/7 + 35a²/28
si on réduit au même dénominateur
= ( 35a² - 60a ) / 28
3 votes
Thanks 1
Sarah349
Oh merci beaucoup!! :D
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Sarah349
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Verified answer
Je note * pour multiplierA=3a(×-2)
= 3a*x - 3a * -2
=3ax -6a
B=×(2-5×)
= x*2 -x*5x
=2x -5x²
C=-3/2(×-6)
=(-3/2)*× -(3/2)* -6 (car 3*6/2 = 9 et - par - ça fait + )
= -3x /2 + 9
D=(-5/7) a (3 - (7/4) a )
est ce que c'est bien la fraction -(5/7) et ensuite la fraction (7/4)
= -5*a *3 /7 + 5*7 a/28
= -15a/7 + 35a²/28
si on réduit au même dénominateur
= ( 35a² - 60a ) / 28