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July 2022
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Когда проложили 1/3 новой электролинии и ещё 21 км,то осталось проложить еще 1/5 всей линии. Найди длину всей электролинии
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Lesben
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Dlina elektrolini.........x km
x/3+21+x/5=x
5x+315+3x=15x
8x+315=15x
7x=315
x=315:7
x=45
(15+21+9=45)
Otvet: 45km
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Answers & Comments
Verified answer
Dlina elektrolini.........x kmx/3+21+x/5=x
5x+315+3x=15x
8x+315=15x
7x=315
x=315:7
x=45
(15+21+9=45)
Otvet: 45km