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daca a+b=25sib+c=35,calculati3a+6b+3c

Răspuns :

a+b= 25
b+c= 35
______
3a+6b+3c= ?
______
3a+3b+3b+3c=
3(a+b)+3(b+c)=
3·25+3·35=
75+105= 180

\weskizq
a+b =25 a+b =25 a+b =25 b+c=35 b+c=35 b+c=35 3a+6b+3c=180