Предмет: Математика, автор: KateEfron

Здравствуйте мне дали домашние задания очень сложные номер 928 На огороде собрали 42кг огурцов и 5/7 всех огурцов засолили. Сколько килограммов огурцов засолили? номер929 Мастерская получила 700м шёлка. Из 2/7 полученной ткани сшили блузки, а из 2/5 полученной ткани сшили платья. Сколько метров шёлка осталось? Помогите Пожайлуста!!!!!!!

Ответы

Автор ответа: yuliyagalkina

0

1 задача

42 кг = 7/7
1/7 = 42 : 7= 6
5/7 = 6*5=30 кг

2 задача.

2/7 и 2/5 приводим к общему знаменателю . Общий знаменатель 35 , получается 10/35 и 14/35
700 м = 35/35
10/35 + 14/35 = 24/35
1/35 = 700 : 35 = 20
20*24 = 480 м
700 - 480 = 220 м

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