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urgent dau coroana multumesc si cinci stelute
daca a+b=45 si axc+bxc=450, calculeaza 3xa+3xb+3xc

x=ori
va rog frumos


Răspuns :

a+b=45
ac+bc=450
3a+3b+3c=?
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ac+bc=450
c(a+b)=450
c*45=450
c=450:45
c=10
a+b+c=45+10=55
3a+3b+3c=3(a+b+c)=3*55=165