Jawabanmu

Jawaban paling cerdas!
2014-09-10T21:58:10+07:00
Jika U3=120 dan U7=160.
U3 = a + 2b = 120
U7 = a + 6b = 160
-ELIMINASI-
b = 10
a = 100
Jadi beda = 10
U15 = 100 + 14.10
=240
trima kasih yahh. maaf lw udh ngrepotin.