Jawabanmu

2014-08-06T22:56:53+07:00
Selesaikan dulu yg didalam kurung
[1+2/3x4] = 4
lalu selesaikan 
(7-8) = -1
(6+5) = 11
lalu
(9x7-1/11) =5,6
jadi 
4 x 5,6 = 22,4