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Daca 2a=72 si. b=40. Calculati. 5a+2b

Răspuns :

2a=72 => a=36
b=40
=> 5a + 2b = 5*36 + 2*40 = 180 + 80 = 260
a=72:2=>a=36=>5a=180 ............2b=80=>5a+2b=260