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What's the meaning of the dash in Chinese Lesson 19 in Volume 1 of grade 6
1. Watch inserted: I looked inside for a while --- cloudy, very dark
2. Table explanation:
A short and stout middle-aged Japanese man, boss Uchiyama, came
I am embarrassed to smile for a while, feel the pocket on the shirt --- there is only more than one yuan left in the pocket
That kind of honest and kind look made me feel touched by my father at once
3. Table turning point
You can buy this book --- this one is better than that one
I took out the silver coin with body temperature from the pocket of my shirt and put it into his hand - how thin his hand is!
4. I'm not finished
I suddenly remembered the interview in which magazine---------
Oh, you, you are-------
5. Table tips
I carefully look at his face - --- thin!
Hope to be able to use, let's encourage
48 is 1 / 3 of the number a and 4 / 7 of the number B. the number a is (), the number B is (), and the number B is a fraction of the number a
A: 48 divided by 1 / 3 is 144,
B: 48 divided by 4 / 7 is 84
B is 7 / 12 of A
Two problems in {urgent} quadratic inequality of one variable and its solution (2)
1. Let 0 ＜ a ＜ 1, f (x) = loga (a ^ (2x) - 2A ^ X-2) to find the value range of x such that f (x) ＜ 0
2. It is known that the odd function f (x) is a monotone decreasing function defined on (- 2,2), when f (2-A) + F (2a-3)
1. According to the meaning of the title, a ^ (2x) - 2A ^ X-2 ＞ 1, namely (a ^ x) ^ 2-2a ^ x-3 ＞ 0
(a^x+1)(a^x-3)>0,
∵a^x>0 ∴a^x>3,
∵ 0 ＜ a ＜ 1, take logarithm on both sides of the above formula to get X
The speed ratio of a and B is 5:4 when they start. After meeting, a decelerates by 20% and B speeds up by 20%. This is not the case
When a arrives at B, B is 115 kilometers away from A. how many kilometers are there between a and B? (arithmetic solution)
5*0.2=1；5-1=4；4*0.2=0.8；4+0.8=4.8；5-4.8=0.2；115/0.2=575；5+4=9；575*9=5175
A mathematical problem about inequality,
On the inequality of X (a ^ 2-1) ^ 2 - (A-1) X-1
If a ^ 2-1 = 0
Then a = ± 1
A = 1, the inequality is - 1
The distance between a and B is 360 km. After a truck leaves from a to B for 1.5 hours, a bus leaves from B to a, and the truck travels 40 km per hour
Add to the above question: the bus travels 42 kilometers per hour, and the two cars can't meet each other until the bus runs for several hours? Thank you for your talent!
The two cars can't meet until the bus runs for X hours
1.5*40+x(40+42)=360
x=300/82=150/41
It takes 150 / 41 hours for the bus to meet
What is the difference between projection and projection in mathematics?
From the perspective of junior high school mathematics (see Chapter 29 projection and view of the people's education network, Vol. 9, e-Textbook), generally speaking, when a light is used to irradiate an object, the shadow obtained on a certain plane (ground, wall, etc.) is called the projection of the object, and the irradiating light is called the projection line, The plane on which the projection is located is called the projection plane, For example, the light in a beam of sunlight or searchlight. The projection formed by parallel light is parallel projection. The projection formed by the same point (light from point source) is called center projection The projection produced by the projection line perpendicular to the projection plane is called orthographic projection. The shape and size of the orthographic projection of an object are related to its position relative to the projection plane
For a highway, team a will complete the construction in 15 days, team B will complete the construction in 20 days, and team a will complete the construction in one day after the joint construction of team a and team B for several days
How many days did Team B repair alone?
Team B repairs x separately
1 / 15 (x + 1) + 1 / 20x = 1 multiplied by 60
4x+4+3x=60
7x=60-4
7x=56
x=8
A: B repaired it alone for 8 days
From the natural numbers of 1, 2, 3 and 4.2004, we can take () numbers at most, so that the difference between any two of these numbers is not equal to 9
1005
Each group consists of 18 numbers, totally 111 groups, and the remaining 6 numbers
Take the first 9 in each group, namely
1-9
19-27
37-45
.
.
1981-1989
Plus the last six numbers 1999-2004
That's 111 * 9 + 6 = 1005
The speed of a passenger car is 60 km / h, and that of a freight car is 45 km / h. The freight car is 135 meters longer than the passenger car. If two cars run in the same direction on parallel tracks, and the passenger car catches up with the freight car from behind, the time for them to cross is 1 minute and 30 seconds, and the length of each car is calculated. If the two cars run in opposite directions on parallel tracks, how long does it take for them to cross?
(1) Suppose the length of the passenger car is x km, then the length of the freight car is (x + 135) km. 1 minute 30 seconds = 1.5 minutes = 0.025 hours. According to the meaning of the question, (60-45) × 0.025 × 1000 = x + X + 135 If x = 120, then x + 125 = 245 A: the body length of a freight car is 245 meters and that of a passenger car is 120 meters. (2) 0.375 ÷ (60 + 45) = 1280 (hours); 1280 hours = 314 (minutes). A: the rendezvous time is 314 minutes
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