Jawabanmu

2014-04-27T11:24:54+07:00
Jawabannya
a. 30
b. -20
jawabanya
a.20+45-(-15)-50=20+45+15-50=30 b.35+25+50-100-(-30)=35+25+50-100+30=40
2014-04-27T11:25:55+07:00
A. 20+60-50
   = 30
b. 35+25+50-100+30
  = 40