Question

Daca a+b=25 si b+c=35 Calculati 3a+6b+3c. Dau coroana.

Answer 1

3a + 6b+ 3c= 3a +3b+3c= 3(a+b)+3 (b+c) = 
3*25+3*35 = 75+105 = 180 
                 sau 
a+b=25
b+c=35
_________
a+2b+c=60/×3
3a+6b+3c=180 
 
      sau 
a+b=25 si b+c=35,calculati 3a + 6b+3c.

3a + 6b+3c = 
3a+3b+3b+3c = 
3(a+b)+3 (b+c)=
3*25+3*35=
75+105
=180  eu  le recomand pe toate alege pe care vrei