Question

suma a2numere este 42.daca vom mari un numar de 3 ori ,iar pe celalt il vom micsora cu 5, numerele vor deveni egale.aflati cele 2 numere.

Answer 1

Fie a si b cele 2 nr
a+b=42
3a=b-5 rezulta a=b-5/3
b-5/3+b=42 |*3
b-5 +3b=126 |+5
4b= 131
b=131/4
a=131/4/3 = 131/4 *1/3

Answer 2

$\left \{ {{3a=b-5} \atop {a+b=42}} \right. \left \{ {{b=3a+5} \atop {a+3a+5=42}} \right. \left \{ {{b=3a+5} \atop {4a=38}} \right. \left \{ {{b=3*9,5+5} \atop {a=9,5}} \right. \left \{ {{b=33,5} \atop {a=9,5}} \right.$