11.04.2022

Если с конца проволоки отрезать 1/6 ее часть, то середина проволоки сместится на 7 см. Найдите первоначальную длину проволоки.

Ответ учителя по предмету Математика

1 — вся проволока

1/2 — половина

1-1/6=5/6 (конечная длина)

5/6:2=5/12 (половина конечной длины)

1/2-5/12=6/12-5/12=1/12 составляют 7 см

7:1/12=7*12=84 (см)

Ответ: начальная длина проволоки 84 см

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