Jawabanmu

2014-05-10T13:49:25+07:00
(5x+3)(2x-4)= 196
10x -12 = 196
10x = 196 + 12
10x = 208
x = 208 ÷ 10 = 20.8
5 × 20.8 = 104 + 4 = 108
2 × 20.8 = 41.6 - 4 = 37.6 
108 × 2 = 216
37.6 × 2 = 75.2 
216 + 75.2 = 291.2 cm