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Постройте отрезок ав длина которого равна 6 см. постройте: а) mn длина которого состаляет 20 % длины отрезка ав; б) отрезок xy длина которого составляет 125% длины отрезка ав 50

Математика

Ответы

akudryashov
6:100*20=1,2см(МN)    6:100*125=7,5см(XY)
garunkhachatryan

№1:Решение

По условию задачи каменщиков 5, значит частей тоже 5. Три части из пяти у каменщиков, которые израсходовали по 326 кирпичей, остальные две части у двух других каменщиков. Разница между этими частями одна пятая, которая равна:

326 * 3 = 978(кирпичей);

далее вычисляем, сколько всего было кирпичей:

978 * 5 = 4890.

ответ: вначале недели каменщики получили всего 4890 кирпичей.

№2:Решение

1) 1/6 + 1/8 = 8/48 + 6/48 = 14/48 = 7/24.

ответ: за 1 час автомобили приближаются к друг другу на 7/24 всего пути.

№3:Решение

1) 48 : 3/4 = 36 (м) отрезали от веревки;

2) 48 – 36 = 12 (м).

ответ: веревка стала равна 12 метров.

lbondareva

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Постройте отрезок ав длина которого равна 6 см. постройте: а) mn длина которого состаляет 20 % длины отрезка ав; б) отрезок xy длина которого составляет 125% длины отрезка ав 50
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