Răspunsuri

2014-10-04T18:34:07+03:00
A+b=36 ; b+c=57 ; a+c=51
b=(b+c)-(a+b)
b=57-36
b=21
a+b=36
a+21=36
a=36-21
a=15
a+c=51
15+c=51
c=51-15
c=36
c-a-b=36-15-21=21-21=0

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2014-10-04T18:35:29+03:00
Din fiecare ecuatie scoatem a,b,c
a+b=36=>b=36-a
b+c=57=>c=57-b
a+c=51=>a=51-c
 Si acum inlocuiesti in c-a-b
57-b-51+c-36-a=0
-b+c-a=36+51-57
Si acum le punem in ordine -b+c-a este echivalent cu c-a-b
deci c-a-b=87-57
c-a-b=30