Question

Ex 3 și 5. Va rogggggggg mult de tot este urgent dau coroana.

Answer 1

4
a/4=b/5=c/8+= (a+b+c)/( 4+5+8)=68/17=4
deci a=4*4=16
b=5*4=20
c=8*4=32 cerinta
Verificare 16+20+32=68cm



5..

1,2a=0,9b=1,5c=k⇒
a=k/1,2= k/(6/5)=5k/6
b=k/0,9=10k/9
c=k/1,5=2k/3
 a+b+c=94
 5k/6+10k/9+2k/3=94
k ( 5/6+10/9+2/3)=94
 k (15/18+20/18+12/18)=94
k*47/18=94  simplificam prin 47
 k*1/18=2
k=18*2=36

a=36:1,2=30
b=36:0,9=40
c=36:1,5=24 cerinta
Verificare 30+40+24=94cm