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1) a+b+c=595
a+b-c=355
a=350
b=? c=?


2) a-b-c=300
a-b+c=400
a=475
b=? c=?


Răspuns :

1) b+c=245
b-c=5

prin metoda reducerii
b-c=5
2b=250

b-c=5
b=250/2=125
c=125-5=120

2)475-(b+c)=300
b+c=475-300=175
475-(b-c)=400
b-c=475-400=75

b+c=175
b-c=75

b-c=75
2b=250
b=250/2=125
c=125-75=50