Question

oblicz niewiadome:

http://img831.imageshack.us/i/jgfhtmlrar.jpg/

Answer 1

 

5/l=9/l+12

5l+60=9l

9l-5l=60

4l=60//:4

l=15

 

12/15=z/12

15z=12x12

15z=144//:15

z=9,6

 

z/12=7,2/k

9,6/12=7,2/k

9,6k=12x7,2

9,6k=86,4//:9,6

k=9

 

7,2/k=m/18

7,2/9=m/18

9m=7,2x18

9m=129,6//:9

m=14,4

 

y/18=12/k

y/18=12/9

9y=18x12

9y=216//:9

y=24 (ale nie jestem pewna)