hola :3
[tex](a+b)-(a-b)=2b\\[/tex]
pasos
[tex](a+b)-(a-b)[/tex]
quitar los parentesis
[tex]=a+b-(a-b)[/tex]
[tex]-(a-b):-a+b[/tex]
[tex]=a+b-a+b[/tex]
simplificar [tex]a+b-a+b:2b[/tex]
[tex]=2b[/tex]
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hola :3
[tex](a+b)-(a-b)=2b\\[/tex]
pasos
[tex](a+b)-(a-b)[/tex]
quitar los parentesis
[tex]=a+b-(a-b)[/tex]
[tex]-(a-b):-a+b[/tex]
[tex]=a+b-a+b[/tex]
simplificar [tex]a+b-a+b:2b[/tex]
[tex]=2b[/tex]
es la A
saludos
att:sam