Question

Suma a doua numere este 27.8 iar diferenta lor este 1.2.Aflati numerele

Answer 1

a+b=27,8
a-b=1,2⇒a=1,2+b
1,2+b+b=27,8
2b=26,8
c=26,6 :2
b=13,3
b=27,8-13,3
b=14,5

Answer 2

[tex] \left \{ {{a+b=27,8} \atop {a-b=1,2}} \right.\\ ------\\ 2a=29=\ \textgreater \ a=14,5\\ 14,5+b=27,8=\ \textgreater \ b=27,8-14,5=\ \textgreater \ b=13,3\\\\ -------\\ 13,3+14,5=27,8(corect)\\ 14,5-13,3=1,2(corect)[/tex]