Jawabanmu

2014-02-17T19:24:34+07:00
a)  7 1/12  x  2 12/34  x  8/15  = 
     85/12 x 80/34 x 8/15
   54400/6120=5440/612=2720/306=1360/153=8 136/153

 b)  4 16/20 x 4/16 x  18/24  =
     4 4/5 x 1/4 x 3/4
    24/5 x 1/4 x 3/4
 72/80
9/10