suma 2 liczb jest równa 120 a ich różnica 80 . Jakie to liczby ?
100 i 20, bo:
100+20=120
100-20=80
x+y=120
x-y=80
___________
2x=200
x=100
100+y=120
y=20
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100 i 20, bo:
100+20=120
100-20=80
x+y=120
x-y=80
___________
2x=200
x=100
100+y=120
y=20
x=100
y=20