English unit 10 section B 2a2b text listening translated into Chinese

English unit 10 section B 2a2b text listening translated into Chinese

Lucy: did you make a new year's resolution this year, Kim Kim:Yes Kim: Yes, Lucy, I did Lucy:What are Lucy: what are you going to do? Kim:Well ,I'm going t...

English translation
3a of part a
Unit 4 is not unit 2

I don't know what to say or do I get nervous before big parties

The translation of reading in unit 11 of the third grade English text of PEP

Can you lend me your pen?
Asking for advice or help is a public and necessary activity, especially when we visit a foreign country. So it's important to know how to ask for information politely, But the first sentence sounds rude. It's important to use the right grammar, but sometimes it's not enough - we need to learn to be polite when we ask for it
In English, like Chinese, we change the way we speak when we talk to different people. The way you express yourself may depend on who you talk to or how familiar you are with them. If you say to your teacher, "where's my book?" it sounds crude. But if you say, "excuse me, Mr. West. Do you know where my book is? "Your question will sound more polite. On the other hand, it may be right to say," where is my book? "Maybe someone close to you
Besides, you don't have to say "Peter, lend me your pen." a very direct English sentence like this sounds rude. It's longer to ask questions politely in English, including "can you "Or" can I ask "Peter, can you lend me your pen?" sounds more polite. Sometimes we even need to spend time leading to a problem. For example, if you stop a stranger walking on the road, We may start by saying, "I'm sorry. I want to know if you'd like to help me?" or "I'm sorry to disturb you."
Due to time constraints, the first three paragraphs, sorry. (Reprinted)

Given the function f (x) (x is not equal to 0), for any nonzero real number x, y, f (XY) = f (x) + F (y)
If y = f (x) is an increasing function on (0, positive infinity) and f (x) + F (1-1 / x) is less than or equal to 0, the value range of X is obtained

If x = 1, then f (y) = f (1) + F (y), so f (1) = 0; if x = y = - 1, then f (1) = f (- 1) + F (- 1), f (- 1) = 0, if y = x, then f (x ^ 2) = f (x) + F (x), that is, f (x) = 1 / 2F (x ^ 2), then f (- x) = 1 / 2F (x ^ 2)

To solve the system of linear equations of two variables,
7x-3y=0
2x-y=1

Solution: 7x-3y = 0. (1)
2x-y=1.(2)
From (2), y = 2x-1
Substituting y = 2x-1 into (1) yields
7x-3(2x-1)=0
7x-6x+3=0
x=-3
y=2x-1=2×(-3)-1=-7
So x = - 3, y = - 7 are the solutions of the original equations
Have a good time

Using derivative definition to find function y = x ^ 2 + 2x-1

f(x)=x2+2x-1
f(x+△x)
=(x+△x)2+2(x+△x)-1
=x2+(2△x+2)x+△x2+2△x-1
f(x+△x)-f(x)
=2△x*x+△x2+2△x
Then [f (x + △ x) - f (x)] / △ x = 2x + △ x + 2
So y '= LIM (△ x → 0) (2x + △ x + 2) = 2x + 2

We know that a, B, C and D are integers, and prove that: (a 2 + B 2) (C 2 + D 2) is the sum of two complete square numbers

It is proved that: (A2 + B2) (C2 + D2) = a2c2 + a2d2 + b2c2 + b2d2 = a2c2 + b2d2 + 2abcd-2abcd + a2d2 + b2c2 = (a2c2 + 2abcd + b2d2) + (a2d2-2abcd + b2c2) = (AC + BD) 2 + (BC AD) 2, so (A2 + B2) (C2 + D2) is the sum of two complete squares

Image of speed and time
The book says: when an object moves in a straight line, in order to more intuitively reflect the movement of the object, it can be represented by the image of speed and time
But why is it not a straight line motion? If it is a curve motion, can't it be expressed?

Curve, a two-dimensional speed time chart can not reflect the speed direction

2x-5>10-3x
Solving inequality

2x-5>10-3x
Item transfer: 5x > 15
The coefficient is changed to one: x > 3

The circumference of a rectangle is 26cm. If the length of the rectangle is reduced by 1cm and the width is increased by 2cm, it will become a square. If the length of the rectangle is xcm, the equation ()
A. x-1=（26-x）+2B. x-1=（13-x）+2C. x+1=（26-x）-2D. x+1=（13-x）-2

Let the length of the rectangle be xcm, then the width is (13-x) cm. According to the equivalent relation: the length of the rectangle - 1cm = the width of the rectangle + 2cm, the equation is: X-1 = (13-x) + 2, so choose B