Question

1. Некий торговец купил товар за 7 долларов, продал его за 8, потом опять купил, но уже за 9 и, наконец, продал за 10 долларов. Какова его прибыль? 2. Во время пребывания космонавта в открытом космосе солнечная сторона его скафандра находится при температуре +140, а теневая сторона при температуре –130°. Определите разность температур солнечной и теневой сторон скафандра. 3. Шмели выдерживают температуру до –7,8°, а пчелы выше этой температуры на 1,4°. Какую температуру выдерживают пчелы? 4. Птица клест - еловик несет яйца и высиживает птенцов зимой. Даже при температуре воздуха – 35° в гнезде температура не ниже 14°. На сколько температура в гнезде выше температуры воздуха? 5. Найдите значение выражения -14,31 : 5,3 – 27,81 : 2,7 + 2,565 :3,42 + 4,1 * 0,8

Answer 1

1. -7+8-9+10=2 доллара
2.|140|+|-130|=140+130=270
3.-7,8+1,4=-6,4
4.|-35|+|14|=35+14=49
5. -14,31 : 5,3 – 27,81 : 2,7 + 2,565 :3,42 + 4,1 * 0,8=-2,7-10,3+0,75+3,28=
=-8,97

Answer 2

1. To calculate the profit, we need to find the difference between the total selling price and the total cost price. Let's break down the given information:

- The trader bought the product for $7 and sold it for $8, making a profit of $8 - $7 = $1. - Then, the trader bought the product again, this time for $9. The previous profit of $1 is not considered in the new cost price. - Finally, the trader sold the product for $10, making a profit of $10 - $9 = $1.

To calculate the total profit, we sum up the individual profits: $1 + $1 = $2. Therefore, the trader's total profit is $2.

2. To find the temperature difference between the sunny and shady sides of the astronaut's spacesuit, we subtract the temperature of the shady side from the temperature of the sunny side.

Given: - Temperature on the sunny side = 140°C - Temperature on the shady side = -130°C

To find the temperature difference, we subtract the shady side temperature from the sunny side temperature: 140°C - (-130°C) = 140°C + 130°C = 270°C.

Therefore, the temperature difference between the sunny and shady sides of the astronaut's spacesuit is 270°C.

3. To determine the temperature that bees can withstand, we need to find the temperature above -7.8°C by adding 1.4°C.

Given: - Temperature limit for bumblebees = -7.8°C - Temperature difference for bees above the limit = 1.4°C

To find the temperature bees can withstand, we add the temperature difference to the temperature limit: -7.8°C + 1.4°C = -6.4°C.

Therefore, bees can withstand a temperature of -6.4°C.

4. To calculate the temperature difference between the nest and the air, we need to subtract the air temperature from the nest temperature.

Given: - Air temperature = -35°C - Nest temperature = 14°C

To find the temperature difference, we subtract the air temperature from the nest temperature: 14°C - (-35°C) = 14°C + 35°C = 49°C.

Therefore, the temperature in the nest is 49°C higher than the air temperature.

5. To evaluate the given expression, we perform the calculations in the given order of operations (parentheses, multiplication and division from left to right, and addition and subtraction from left to right).

Given expression: -14.31 / 5.3 - 27.81 / 2.7 + 2.565 / 3.42 + 4.1 * 0.8

Performing the calculations:

-14.31 / 5.3 = -2.7 -27.81 / 2.7 = -10.3 2.565 / 3.42 = 0.75 4.1 * 0.8 = 3.28

Now, substitute the calculated values back into the expression:

-2.7 - 10.3 + 0.75 + 3.28 = -9.97

Therefore, the value of the given expression is approximately -9.97.