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Fill in the appropriate conditions according to the formula. The original price of a garment is 120 yuan. What is the current price? （1）（?）：120×85％ （2）（?）：120÷（1＋1/4）
(1) (now 15% off): 120 × 85%
(2) (the current price is 1 / 4 higher than the original price): 120 ÷ (1 + 1 / 4)
The original price of a piece of clothing is 120 yuan. After the price is increased by 20%, the price will be reduced by 20% on this basis. The price at this time will be calculated compared with the original price!
120-120x（1+0.2）x(1-0.2)
=120-115.2
=4.8
The price is 4.8 yuan lower than the original
If the dynamic friction coefficient between the skis and the slope is three sixths root, the slope inclines to 30 degrees, the work done by the skiers in the process of getting to the bottom of the slope and the speed of the skiers at the bottom of the slope g = 10, can the skiers get to the top of the slope if the skiers are given an initial speed of i10m / s from the bottom of the slope If you can't slide on the slope, how high is it?
(1) First, the work done by gravity is the direct gravity g times the height H
(2) Then the work done by the friction force is m * g * cos 30 ° * friction coefficient f * h * 1 / sin 30 °
(3) The speed of skiers at the bottom can be done by energy conservation, that is, the kinetic energy of skiers at the bottom + gravitational potential energy + work done by friction = gravitational potential energy of skiers at the top
(4) If the kinetic energy of the athlete at the bottom of the slope + the work done by the friction in the process of sliding up the top of the slope is greater than the gravitational potential energy of the athlete just standing at the top of the slope, then the athlete can slide up the top of the slope, Otherwise, it can't. If it can't, then the energy conservation is used to calculate the height that the skier can reach, that is, the kinetic energy of the skier moving at 10m / S = the gravitational potential energy of the skier sliding to the slope just at rest + the work done by the friction on the slope
We can calculate the height H1 of an athlete
In a square water tank full of water with 20 cm long edges (measured from the inside), there is a rectangular iron block 16 cm long and 10 cm wide
When the iron block is taken out, the water in the water tank drops by 2 cm. What is the height of the iron block?
The height of this iron block is 20 × 20 × 2 (16 × 10) = 5cm
7.014km = () m 0.32m = () min
7.014 km = () m 0.32 M = () decimeter 5.03 t = () kg 0.54 square decimeter = () square centimeter 0.68 square meter = () square decimeter
7014
Simplification (7-5 √ 2) ＾ 2012 * (- 7-5 √ 2) ＾ 2011 =?
（7-5√2）＾2012 *（-7-5√2）＾2011
=【（7-5√2）×（-7-5√2）】＾2011 ×（7-5√2）
=【50-49】＾2011 ×（7-5√2）
=7-5√2
My brother has 55 science and technology books and some storybooks. The number of science and technology books is 14 times less than that of storybooks. How many storybooks does my brother have?
Suppose brother has x storybooks, 3x-14 = 55, & nbsp; & nbsp; 3x = 69, & nbsp; & nbsp; X = 23, answer: brother has 23 storybooks
Car a and car B start from a and B at the same time. When car a reaches 3 / 7 of the whole journey, car B runs 36 kilometers. When car a reaches 7 / 10 of the whole journey, car B runs 7 / 10 of the whole journey. How many kilometers is the distance between two places? (don't use solving equation)
Line a 3 / 7, line B 36 km
Then the total distance unit of line a is 1, and line B is 36x7 / 3 = 84km
Then the whole journey = 84 / (7 / 10) = 120 km
7 / 3 comes from this. Let's take a look at how many 3 / 7S are included in unit 1 in the whole journey, and how many 36 kilometers are included in unit B
A EMU and an ordinary express train from Shanghai and Nanjing to Beijing at the same time. The railway between Shanghai and Nanjing is about 300 km long, a few hours after departure
Can EMU catch up with ordinary driving? EMU 180 km / h, ordinary 80 km / h
Three hours
180X—300=80X
（180—80）X=300
100X=300
X=3
Reading comprehension answers to the fifth grade Chinese exercise book Lesson 7 of Jiangsu Education Press?
1. The reason why we are fond of the moon is that: (1) the moon can receive abundant solar energy; (2) the moon is rich in mineral resources, especially nuclear fusion fuel helium-3.2, which can be used; (1) once human beings establish a base on the moon, they can directly use helium-3 as rocket fuel; (2) due to many reasons such as gravity and no wind, etc
RELATED INFORMATIONS
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