Question

Aflati numerele a , b,c tiind ca sunt direct proportionale cu 2,5 si 8 iar 3a+5b-2c=45

Answer 1

a/2=b/5=c/8=k⇒a=2k,b=5k,c=8k
⇒3a+5b-2c=45⇔3x2k+5x5k-2x8k=45
⇒6k+25k-16k=45
15k=45
k=45:15
k=3
⇔a=2x3=6
b=5x3=15
c=8x3=24