Question

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

Answer 1

a/2=b/5=c/8
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=3x2=6
b=3x5=15
c=3x8=24