Jawabanmu

2014-08-17T22:24:38+07:00
A. x/4=9/12
x. = 4.9/12 = 3
b. 9/x = 15/12
x. = 9.12/15 = 36/5 = 7,2
c. 15/y+4 = 20/16
y+4. = 15.16/20
y+4. = 12
y. = 12-4 = 8
2014-08-17T22:27:31+07:00
A . x/4=9/12
12x=36
x=3
b . 9/x=15/12
15x=108
x=7,2
c . 15/y+4=20/16
y+4=12
y=12-4
y=8