What is the text on page 20 of PEP seventh grade volume I Chinese self reading textbook?

What is the text on page 20 of PEP seventh grade volume I Chinese self reading textbook?

Is it 20 pages or 20 lessons? If it's 20 pages of children's fun, it's not a self reading textbook. If it's 20 lessons of mountain city, it's what you call a self reading textbook!

Type out the last paragraph of the fifth grade Chinese Book Volume 1 Lesson 19
In a hurry

Over the years, the two voices I heard as a teenager have been intertwined in my ears: "wonderful", "terrible"; "wonderful", "terrible" They blow to me like two winds. I hold the boat of life carefully so that it won't be blown down by any wind. I know from the bottom of my heart that

Fifth grade first volume Chinese Book 19 lesson last paragraph understanding, urgent

1. What do these two winds refer to? A: they refer to the two kinds of love of parents, one wind refers to praise and one wind refers to criticism. 2. What does "not be blown down by which wind" mean? A: "not being blown down by which wind" means that you are not lost by praise or criticism

It is known that a, B and C are three sides of the triangle ABC, and satisfy a & # 178; (C & # 178; - A & # 178;) = B & # 178; (C & # 178; - B & # 178;)
It is known that a, B and C are the three sides of the triangle ABC, and satisfy a & # 178; (C & # 178; - A & # 178;) = B & # 178; (C & # 178; - B & # 178;). Try to judge the shape of the triangle

And we're going to be 178; C & \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\178; - B & # 178;) (A & # 178; + B & # 178; - C & # 178;) = 0, so a = B or a & # 178; + B &

The distance from place a to place B is 48 kilometers. It takes one hour and 15 minutes to complete the whole journey from place a to place B by bike. According to this calculation, how many hours will it take to complete the whole journey

5 / 4 divided by 5 / 8 = 2

If the average of a set of data: - 4, - 1,0,1, X is equal to the mode, then how much is x equal to?

The average of data - 4, - 1,0,1, X is (- 4-1 + 0 + 1 + x) / 5,
If x = - 4, then (- 4-1 + 0 + 1 + x) / 5 = - 8 / 5
If x = - 1, then (- 4-1 + 0 + 1 + x) / 5 = - 1
If x = 0, then (- 4-1 + 0 + 1 + x) / 5 = - 4 / 5
If x = 1, then (- 4-1 + 0 + 1 + x) / 5 = - 3 / 5
So x = - 1

Party A and Party B are going towards each other, with a speed of 50 meters and B speed of 60 meters. They meet at a distance of 50 meters from the midpoint of the two places?

Encounter time 50x2 △ 60-50 = 10 minutes
Distance (50 + 60) X10 = 1100m
I'm glad to help you,

1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + 1 / 32 = 1 - () = ()

1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + 1 / 32 = 1 - (1 / 32) = (31 / 32)

The railway line from Lanzhou to Urumqi is about 1900km long. On a map, the distance between the two places is 5cm. What's the scale of this map
I will not tell you. Come on

Scale = map distance / field distance
The scale of this map is 5cm / 1900km = 5cm / 190000000cm = 1 / 38000000
The scale of this map is 1 / 38 million
Or one in 38 million
Or 1 cm on the map represents the actual distance of 380 km

It is known that a, B and C are positive real numbers, satisfying a ^ 2 = B (B + C), B ^ 2 = C (c + a). It is proved that 1 / A + 1 / b = 1 / C

b²=c(c+a)
Then, B & # 178; - C & # 178; = ca
And the left and right sides of a & # 178; = B (B + C) are multiplied respectively,
a²(b+c)(b-c)=cab(b+c)
a(b-c)=bc
ab=bc+ac
Then, 1 / A + 1 / b = 1 / C