Bonjour
1) développer et réduit
a) ( x-3)(2x+1)
b) (x-4)^2 -(2x-5)(x+2)
c)(x-5)^2

2) Factorise
1) xy+xz
2)(4x^2)-6x
3) 3xy+x
4) (x-3)(2x+5)+(x-3)(8-x)
5) (x-3)(2x+5)-(x-3)(8-x)
6) ((x-3)^2) - 16
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