номер 6
12/13=18x/39
18x=12*39/13
18x=468/13
18x=36
x=36/18
x=2
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Ответ: x=2
Nomer 5
1,2/6=3/15
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номер 6
12/13=18x/39
18x=12*39/13
18x=468/13
18x=36
x=36/18
x=2
---------------------------------------
Ответ: x=2
Nomer 5
1,2/6=3/15