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Sagot :

comment réduire l'expression (a+2)+(a-1)+2+(a+1)
=a+2+a-1+a+1+2
=3a+4
(a+2)+(a-1)+2+(a+1)
= a + 2 + a - 1 + 2 + a + 1
= a + a + a + 2 + 2 - 1 + 1
= 3a + 4.

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