В каком на примеров сложение выполнено верно?

1) 1/5+2/3=1+2
3•5
2)1/5+2/3=1+2
3+5
3)1/5+2/3=1•3+2•5
3•5
4)1/5+2/3=1•3+2•5
3+5
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