I ll do it, you do it

The house price is 300 yuan, the boss decided to discount them for 50 yuan, and the boss actually charged 250 yuan. The 50 wen sent by the shopkeeper was taken by the shopkeeper 20 wen, and the remaining 30 wen was returned to the three students. Therefore, each of the three scholars actually only paid 90 yuan, and the sum of the three people was 270 yuan, "plus the 20 yuan that the shopkeeper embezzled, a total of only 290 yuan," is a wrong understanding.

It should be "plus the 20 wen money that the shopkeeper privately swallowed, a total of only 270 wenyuan," not the 10 wenqian ** wen, it should be the shopkeeper who privately swallowed 20 wenqian from three scholars.

They got it wrong, and 10 more were swallowed up. In fact, Xiao Er took 20 texts, left 30 texts, and only 250 texts left after 300 texts. 20 + 30 + 250 = 300 (text) is very simple!

The answer is: The boss actually received 250 yuan, and the shopkeeper took 20 yuan from it, which adds up to 270 yuan from the three students.

In fact, the ten yuan is not missing, the 250 yuan plus 20 yuan should be paid, plus 30 yuan is exactly 300 yuan.

The boss actually received 250 yuan, and the shopkeeper took 20 yuan, adding up to 270 yuan taken out by three students.

The three of them paid a total of 270 yuan, 20 yuan for the second shopkeeper, and the remaining 250 yuan for the boss.

Because they're so pathetic|

First of all, calculate the area of the trapezoidal (4+7)*4 2 to get 22. Calculate the area of a quarter circle, 1 4 r is 1 4 * * to get. Finally, subtract the shaded portion of the area of a quarter circle from the trapezoidal area.

An electronics manufacturer put into production a new type of electronic products, the manufacturing cost of each piece is 18 yuan, and it is found in the process of trial marketing that the relationship between the monthly sales volume y (10,000 pieces) and the sales unit price x (yuan) can be approximately regarded as a function y=-2x+100 (profit = selling price - manufacturing cost).

1) Write the functional relationship between the monthly profit z (10,000 yuan) and the sales unit price x (yuan);

2) When the sales unit price is how much yuan, the manufacturer can get a profit of 3.5 million yuan per month? When the sales unit price is how much yuan, the manufacturer can get the maximum profit per month? What is the maximum profit?

3) According to the regulations of the relevant departments, the sales unit price of this electronic product can not be higher than 32 yuan, if the manufacturer wants to obtain a profit of not less than 3.5 million yuan per month, then how many yuan is the minimum manufacturing cost of manufacturing this product per month?

1. The single digit number is 1 less than the ten digits

The ten digits cannot be 0

2. The hundred-digit number is 5 larger than the ten-digit number

The ten digits cannot be greater than 4

To sum up, a ten-digit number can only be this number could be

1 Fresh and bright, positive and high-spirited.

2 A new life in Yan'an.

3 Dayan Spring Water Wanderer Flowing, unstable, turbulent.

4 It is positive to be able to name a little reason why you like it.

5 Such as: "Singing", "Selling Judgment is Remembering a Spinning Wheel" (author Wu Boxiao); "The Words of the Sun" (the author laughs at Ai Qing) and so on. Students should be exposed to more literary works to enrich themselves.

The answer is not unique).