Question

aflati numerele a,b,c stiind ca sunt direct proportionale cu 2,5si 8 iar 3a+5b-2c=45
Vaa rog ajutati-ma!!!!

Answer 1

Răspuns:

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