<span><span>Пусть угол DOK=x </span><em><span>NOD=3x,</span><span>3x+x=120 </span><span>,4x=120 </span><span>,x=120:4 </span><span>,x=30 </span></em><span><em><u>,угол DOK=30</u> !!!</em>
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1)5×4=20
2)20+5=25
Ответ:У Тани 25 тетрадей
2)-29-28-30=-87
3) -5 -4 -3 -2 -1 0 1 2 3