Salut
[tex]\rule{6cm}{1mm}[/tex]
Développons les expressions.
[tex]\boxed{A=2(x-3)}[/tex]
[tex]\boxed{A=2\times x +2\times (-3)}[/tex]
[tex]\boxed{\boxed{\green{A=2x-6}}}[/tex]
[tex]\boxed{B=3x(2x+5)}[/tex]
[tex]\boxed{A=3x\times 2 +3x\times 5}[/tex]
[tex]\boxed{\boxed{\green{B=6x^{2}+15x}}}[/tex]
[tex]\boxed{C=x-(3-2x)}[/tex]
[tex]\boxed{C=x-3+2x}[/tex]
[tex]\boxed{\boxed{\green{C=3x-3}}}[/tex]
[tex]\rule{6cm}{1mm}[/tex]
