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Sagot :

= (4x+3)_(8-2x)
= 4x+3_8+2x
= 4x + 2x +3-8
= 6x-5

= 5x^2+(3x-4)-(2^2+3)+6x
= 5x^2+3x-4-4-3+6x
=5x^2+3x+6x-4-4-3
=5x^2 +9x-11

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