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a+2d=26
b+2c=26
2a+c=20


a=?
b=?
c=?
d=?

Răspuns :

EmilJoaca
(din 2a+c=20)
2a = 20-c
c =20-2a
=> 2a = 20-2a => 4a = 20 => a = 5
c = 20-2a => c = 20-10 => c = 10

(din b+2c=26)
b = 26-20 => b=6

(din a+2d=26)
a = 26-2d => 5 = 26-2d => 2d=21 => d = 10.5