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Ancuta are timbre romanesti si straine in total 36.stind ca timbrele romanesti reprezinta intreirul celor straine cate timbre de fiecare fel are ancuta



Răspuns :

timbre s (un segment)
timbre r (trei segmente)       suma 36

1. Cate timbre straine are Ancuta?
36:4 = 9

2. Cate timbre romanesti are Ancuta ?
9x3=27
a+b=36
a=3b
Inlocuim in prima relatie
3b+b=36
4b=36/:4
b=9=>a=3*9=27
*=semnul ori