Question

1.В мастерскую привезли лист фанеры 42дм на 62 дм. Для обшивки двери отрезали 1/3 листа. Сколько квадратных дециметров фанеры осталось? 2. 19м37см+7м8мм 5ч12мин-37мин 8т2кг+187кг 13а-17м2 3. 740-248:4+128*(36:12) 465*185 996:9

Answer 1

Ответ:

1736дм

Пошаговое объяснение:

1.42*62=2604

2.2604/3=868

3.2604-868=1736

Answer 2

1. В мастерскую привезли лист фанеры 42 дм на 62 дм. Для обшивки двери отрезали 1/3 листа. Сколько квадратных дециметров фанеры осталось?

To find out how many square decimeters of plywood are left after cutting off 1/3 of the sheet, we need to calculate the area of the remaining piece.

The original sheet of plywood measures 42 dm by 62 dm, which means its area is 42 dm * 62 dm = 2604 square dm.

To find 1/3 of the sheet, we can multiply the area of the whole sheet by 1/3: 2604 square dm * 1/3 = 868 square dm.

Therefore, after cutting off 1/3 of the sheet, there are 868 square decimeters of plywood left.

2. 19м37см 7м8мм 5ч12мин-37мин 8т2кг 187кг 13а-17м2

Let's break down the given expression step by step:

- 19м37см can be converted to centimeters by multiplying the meters by 100 and adding the centimeters: 19m * 100cm/m + 37cm = 1900cm + 37cm = 1937cm.

- 7м8мм can be converted to millimeters by multiplying the meters by 1000 and adding the millimeters: 7m * 1000mm/m + 8mm = 7000mm + 8mm = 7008mm.

- 5ч12мин - 37мин can be calculated by subtracting 37 minutes from 5 hours and 12 minutes: 5 hours * 60 minutes/hour + 12 minutes - 37 minutes = 300 minutes + 12 minutes - 37 minutes = 275 minutes.

- 8т2кг can be converted to kilograms by multiplying the tons by 1000 and adding the kilograms: 8t * 1000kg/t + 2kg = 8000kg + 2kg = 8002kg.

- 187кг remains the same.

- 13а - 17м2 can be calculated by subtracting 17 square meters from 13 acres. However, we need to convert acres to square meters first. 1 acre is equal to 4046.86 square meters: 13 acres * 4046.86 square meters/acre - 17 square meters = 52610.18 square meters - 17 square meters = 52610.18 square meters.

Therefore, the calculations are as follows: - 19м37см = 1937cm. - 7м8мм = 7008mm. - 5ч12мин - 37мин = 275 minutes. - 8т2кг = 8002kg. - 187кг remains the same. - 13а - 17м2 = 52610.18 square meters.

3. 740-248:4 + 128*(36:12) + 465*185 + 996:9

Let's break down the given expression step by step:

- 740 - 248:4 can be calculated by dividing 248 by 4 and subtracting the result from 740: 248 / 4 = 62. 740 - 62 = 678.

- 128 * (36:12) can be calculated by dividing 36 by 12 and multiplying the result by 128: 36 / 12 = 3. 128 * 3 = 384.

- 465 * 185 can be calculated by multiplying 465 by 185: 465 * 185 = 86025.

- 996:9 can be calculated by dividing 996 by 9: 996 / 9 = 110.6666667 (rounded to 7 decimal places).

Therefore, the calculations are as follows: - 740 - 248:4 = 678. - 128 * (36:12) = 384. - 465 * 185 = 86025. - 996:9 = 110.6666667 (rounded to 7 decimal places).

Please note that the results of the calculations are rounded to the nearest whole number or a specific number of decimal places, as indicated.