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1pix.+1carte=10 lei. 1carte+1caiet=9lei. 1caiet+1pix=5 lei. cât costa pixul

Răspuns :

1pix+1carte=10=> 1carte=10-1pix 1carte+1caiet=9=>1caiet=9-(10-1pix)=1pix-1 1caiet+1pix=5=>1pix=5-(1pix-1)=5-1pix+1=6-1pix=> 2pixuri=6=> 1pix=3 lei
 3 lei costa pixul iate 3lei+7lei=10lei   7lei+2lei=9lei    2lei+3lei=5lei