Jawabanmu

2014-04-25T15:09:55+07:00
36=a+a+b+a+2b=3a+3b | a+b=12 || 147=a+39b+a+38b+a+37b=3a+114b | a+38b=49 || dieliminasi | 37b=37 | b=1 | a=11 | a+39b=11+39=50 | S40=40/2(11+50)=20(61)=1220 hitung ulang yaa semoga membantu^^ maaf berantakan