afla numerele a,b,si c,stiind ca a+b=300,b+c=500,iar a+c=400
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a+b=300⇒a=300-ba+c=400⇒300-b+c=400
b+c=500
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300-b+c+b+c=400+500
300+2c=900
2c=900-300
2c=600
c=600:2
c=300
a+c=400 si c=300 ⇒a+300=400⇒a=400-300⇒a=100
a+b=300 si a=100⇒100+b=300⇒b=300-100⇒b=200
b+c=500
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300-b+c+b+c=400+500
300+2c=900
2c=900-300
2c=600
c=600:2
c=300
a+c=400 si c=300 ⇒a+300=400⇒a=400-300⇒a=100
a+b=300 si a=100⇒100+b=300⇒b=300-100⇒b=200
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