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HelpHomework
@HelpHomework
April 2019
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Je ne comprend pas du tout merci
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caylus
Verified answer
Bonjour,
pas évident!!!
1: u=3/2a+b
2:
a=2x+y (1)
b=x+3y (2)
u=-4x+3y
(1) et (2)=>x=3/5a-b/5 , y=-a/5+2b/5
=>u=-4*(3/5a-b/5)+3*(-a/5+2b/5)=-3a+2b.
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Verified answer
Bonjour,pas évident!!!
1: u=3/2a+b
2:
a=2x+y (1)
b=x+3y (2)
u=-4x+3y
(1) et (2)=>x=3/5a-b/5 , y=-a/5+2b/5
=>u=-4*(3/5a-b/5)+3*(-a/5+2b/5)=-3a+2b.