Răspunsuri

2014-11-11T18:39:08+02:00
X,y-numerele necunoscute
x+y=15
x=2y-3  => 2y-3+y=15
2y+y=18
3y=18
y=6
x=15-6
x=9
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2014-11-11T18:40:42+02:00
A+b=15
a=2b-3
2b-3+b=15
3b-3=15
3b=15+3
b=18:3
b=6
a+6=15
a=15-6
a=9
a=9    b=6
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