Răspunsuri

2014-05-20T21:29:28+03:00
A+b=80
2a-3b=35
2a=35+3b
a=(35+3b)/2

(35+3b)/2 +b=80 aducem la acelasi numitor
35+3b+2b=160
5b=160-35
5b=125
b=25
a=80-25
a=55
1 3 1
2014-05-20T21:39:07+03:00
A+b=80
2xa-3xb=35
2a-3b=35
a,b=?
a+b=80
a=80-b
2a-3b=35
2(80-b)-3b=35
2x80=160
160-2b=35
160-35=2b
125=2b
b=125:2
b=62,5
a+b=80
a=80-b
a=80-62,5
a=17,5