Răspunsuri

2014-04-30T21:04:40+03:00
B-3c= 24 ->> b= 24 + 3c
2a = 24 --> a =24;2=12
a+b+3c=108
12+24+3c+3c=108
36 + 6c= 108
6c=72
c=12
B= 24 +3c= 24 + 3x12=24 + 36=60
--> 7a+5b+3c=7x 12+ 5x60 + 3x12= 84+ 300+ 36=420
poti rezolva tot de la inceput pas cu pas? :) ( si cum ai ajuns la b-3c=24 si tot .... ) daca vrei .
Sigur :P
2014-04-30T21:10:55+03:00
B-3c=24
b=24+3c
20=24=>a=12
12+24+3c+3c=108
36+6c=108
6c=72
c=12
b=24+36=60
7a+5a+3c=84+60+12=156

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