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Sagot :

1)

a= 9x²-(4x²-12x+9)

= 9x²-4x²+12x-9

= 5x²+12x-9

2)

a) x=2

a= 5(2)²+12(2)-8= 26

b) x=3/2

a=5(3/2)²+12(3/2)-8

= 5(9/4)+6*3-8

= 45/4+10

a=85/10

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