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daca a+b=45 si axc+bxc=450,calculati 3xa+3xb+3xc

Răspuns :

Mariangel
a+b=45
a*c+b*c=450, deci
c(a+b)=450
c*45=450, de unde
c=10

3a+3b+3c=3(a+b+c)=3(45+10)=3*55=165
Miha1107
a+b=45
a×c+b×c=450⇒c×(a+b)=450⇒c×45=450⇒c=450:45⇒c=10
3×a+3×b+3×c=3×(a+b)+3×10=3×45+3×10=3×(45+10)=3×55=165

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