a fost răspuns

Calculati 7a+5b+3c stiind ca 2a=b-3c=24 si a+b+3c=108.

Răspuns :

Apidelleask
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
Rbianca68ask
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

Ask Alte intrebari