Question

На уроке Математики 1/5 часть времени была затрачена на проверку домашнего задания,1/2 часть на объяснение новой темы,а оставшееся время на решение задач Какую части времени урока было затрачено на решение задач? ответ переведи в десятичную дробь

Answer 1

Ответ:

Пошаговое объяснение:

1) 1/5 + 1/2 = 2/10 + 5/10 = 7/10 - было затрачено на проверку и новую тему.

2) 1 - 7/10 = 10/10 - 7/10 = 3/10 - на решение задач

3/10 = 0,3

Answer 2

Problem Analysis

In this problem, we are given that 1/5 of the time in a math lesson was spent on checking homework, 1/2 of the time was spent on explaining a new topic, and the remaining time was spent on solving problems. We need to determine the fraction of time spent on solving problems and convert it to a decimal.

Solution

To find the fraction of time spent on solving problems, we need to subtract the fractions of time spent on checking homework and explaining a new topic from 1 (since the total time is represented by 1).

Let's calculate the fraction of time spent on solving problems:

1 - (1/5 + 1/2)

To simplify this expression, we need to find a common denominator for 5 and 2, which is 10:

1 - (2/10 + 5/10)

Now, we can add the fractions:

1 - (7/10)

To subtract the fractions, we need to find a common denominator, which is 10:

10/10 - 7/10 = 3/10

Therefore, 3/10 of the time in the math lesson was spent on solving problems.

To convert this fraction to a decimal, we divide the numerator (3) by the denominator (10):

3 ÷ 10 = 0.3

So, the fraction of time spent on solving problems is 0.3 when expressed as a decimal.

Answer

The fraction of time spent on solving problems in the math lesson is 3/10, which is equivalent to 0.3 when expressed as a decimal.