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Sagot :

a) (6x -4)(2x +5) - (3x +2)(2x +5)

a) (2x+5)(6x-4-(3x+2))

a) (2x+5)(6x-4-3x-2)

a) (2x+5)(3x-6)

a) (2x+5)3(x-2)

a) 3(2x+5)(x-2)

b) 9t² -64

b) 3²t² -8²

b) (3t -8)(3t +8)

c) 25x²+9+30x

c) 25x²+30+9

c) (5x+3)²

d) (5x-7)(3x-2)-(x-8)(3x-2)

d) (3x-2)(5x-7-(x-8))

d) (3x-2)(5x-7-x+8)

d) (3x-2)(4x+1)

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