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Se stie ca a+b+c=7 . Calculati
a) 2a +2b +2c
b) 10a+10b+10c
c) a · 13+ b · 13+ c · 13+21

Răspuns :

MuffinBlueberry
a)2a+2b+2c=7*2=14
b)10a+10b+10c=7*10=70
c)13a+13b+13c+21=7*13=21=91+21=112

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