Răspuns :
Formula este:
[tex]a-b=c\implies a = c + b[/tex]
O aplici si in acest caz:
[tex]a-30=40\implies\\a=40+30\\a=70[/tex]
Verificare:
[tex]70-30=40\:(A)[/tex]
[tex]a-b=c\implies a = c + b[/tex]
O aplici si in acest caz:
[tex]a-30=40\implies\\a=40+30\\a=70[/tex]
Verificare:
[tex]70-30=40\:(A)[/tex]