In the 100 meter race, Xiao Dong used 18 seconds, Xiao Ming used 1 / 4, who runs fast

In the 100 meter race, Xiao Dong used 18 seconds, Xiao Ming used 1 / 4, who runs fast

Xiao Ming Kuai

The results of Xiaoming and Xiaoliang in the 100 meter race are 18% and 17% respectively. Who can run faster?

Xiao Liang runs fast

Xiaoming's home is 1.2km away from the school, Xiaoming walks 100m every minute, Xiaoli's home is 0.95km away from the school, and Xiaoli walks 75m every minute. How many minutes will the distance between the two people to the school be equal

There are 28 boxes of pens and pencils in Chenguang stationery store, with a total of 300 pens. There are 10 pens in each box and 12 pencils in each box. How many pens do you have?

Pen: (12 × 28-300) △ 12-10 = (336-300) △ 2 = 36 △ 2 = 18 (box), pencil: 28-18 = 10 (box), answer: pen 18 boxes, pencil 10 boxes

It costs 22 yuan to buy 3 pencils and 2 pencils. It is known that each pencil is 5 yuan less than each pen. How much is the price of each pencil and pen
Strategy: replace three pencils with three pens, so that the total price is 22 yuan (fill in "more" or "less") () yuan. Now the total price of five pens is () yuan. Each pen is () yuan
Strategy 2: replace two pens with two pencils, so that the total price is 22 yuan (fill in "more" or "less") () yuan. Now the total price of five pens is () yuan. Each pen is () yuan
Answer: each pencil is () yuan, each pen is () yuan

Strategy one 1, 15 yuan more 2, 37 3, 7.4
Strategy 2 1. Less ten yuan 2,12 yuan 3,2.4 yuan
Pencil 2.4 yuan, pen 7.4 yuan
(wrong title)
The problem is very simple to solve by equation

Mother bought a pen and three pencils for 12.8 yuan. The unit price of pen is five times that of pencil. How much is the unit price of pen and pencil?

3+5=8、12.8/8=1.6
1.6 * 3 (pencil) = 4.8, 1.6 * 5 (pen) = 8
8+4.8=12.8.

Give you a piece of paper, a pencil and a ruler with a minimum scale of 1 mm. How do you measure the circumference of a one dollar coin with these instruments? (please write down the measurement steps)______ ．

Roll a dollar coin on white paper, record its track with pencil, and measure its length with a ruler

Give you a piece of paper, a pencil and a ruler with a minimum scale of 1 mm. How do you measure the circumference of a one dollar coin with these instruments? (please write down the measurement steps)______ ．

Roll a dollar coin on white paper, record its track with pencil, and measure its length with a ruler

How to use the scale to measure the circumference of 1 yuan coin

It's very simple to measure the diameter of a coin with a scale, and then multiply the diameter by π to be the circumference. You can also make a mark anywhere on the side of the coin, and then align the zero point of the scale with the mark. The edge of the scale is close to the coin and rotates along the side of the coin for one circle, and the scale value is the circumference of the coin

Measure the circumference of a dollar coin
Unique

Rolling method: solution 1: make a mark at any point on the circumference of the one dollar coin; 2. Align the mark with the zero scale of the scale and roll it around the scale; 3. Record the scale of the mark alignment at this time; 4. The circumference of the one dollar coin is solution 2: make a circle around the circumference of the one dollar coin with a string and make a mark at the beginning and end