Question

CALCULATI ,A, ,B, ,C, STIND CA A+B+C EGAL 789 , A+B EGAL 666 , B+C EGAL 355

Answer 1

a+b+c=789 (**)


a+b=666
b+c=355
Adun ultimele 2 ecuatii si obtin: a+2b+c=666+355
a+2b+c=1021 (*)

Din ecuatia (*) scad ecuatia (**) si obtin: a+2b+c-a-b-c=1021-789
b=232

a+b=666=>a=666-b = 666-232=434

b+c=355=>c=355-b=355-232=123

Raspuns: a=434, b=232, c=123

Answer 2

a+b+c=789
a+b=666
b+c=355
666+c=789
c=789-666
c=123
666+123=789
b+c=355
b+123=355
b=355-123
b=232
232+123=355
a+b=666
a+232=666
a=666-232
a=434
434+232=666
proba
a+b+c=789
434+232+123=789
succes!