Jawabanmu

2014-08-30T20:37:39+07:00
A) (2x.2) - (2.2) - (x.2) = 4x - 4 - 2x = 4x - 2x - 4 = 2x - 4
b) 21/2 - 2 - 1/2 = 21/2 - 4/2 - 1/2 = 16/2 = 8