Jawabanmu

2014-01-14T20:29:34+07:00
Dik : 
a + b = 100
a - b = 40
dij  :
a = 40 + b
(40 + b) + b = 100
40 + 2b = 100
2b = 100 - 40 
b = 60/2
b = 30
a = 40 + b
a = 40 + 30
a = 70
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