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a+b=24;b+c=18;c+a =26 a=?;b=?;c=?

Răspuns :

a + b = 24, b = 24 - a
b + c = 18, c = 18 - b = 18 - (24 - a) = 18 - 24 + a = a - 6
c + a = 26, c = 26 - a
Deci 26 - a = a - 6
2a = 26 + 6 = 32
a = 16
b = 24 - 16 = 8
c = 26 - 16 = 10
a+b+c=(24+18+26):2
a+b+c=34
a+b=24
c=34-24=10
b+c=18
b=18-10=8
a+b=24
a=24-8=16

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