1971-08-30 — Page 13

郭日僑華

第二張四第日十初月七年亥辛服夏 WAH KIU YAT PO

一期星日十三月八年一七九一屆公羊十六國旗

育教僑費

他踏政所。從英文

業同學

暑期進修專欄

OK(90K)串

智慧出版社主編

新

數學 (十二)

放上者,便民促重:河沿

成人在嘛的人益

英 際條只有的鮮

對

Elementary Modern Mathematics

Lesson 12

Laws of division.

Numbers

We have seen in the previous lessons

that division is the opposite operation of

multiplication. Does this means that the

laws hold for multiplication still holds for

division ? Let's see.

From the examples

一有乖于的同等地位,但神航不冤是一個妾侍,所

以有。粧如

的正地步間,以肤,女的们的法告特相

•華生

深

以

•皮称去

交智,只作,它對文作 ¬水司够的歌以一示

·報告書的內容大

個而艾職 一員們交開濕

馬地味茶

房倒千成用,而乎只政

] 「文」上面。「定

Sa

45

爭取中文法定地位是否已成功?

XXO

教

保定刑爆空副将设成成有

在一個警之何做列忘,英国

策:內然未落球員的立但官的

0.25

10

we can see that the commutative law

does not hold for division.

Does the associative law hold

小學畢業同學暑期進修專欄

your teacher, who else was

with you?

智慧出版社主編

He was saved from the

boat:

The ship was in

of sinking

during the atorm.

英文

8

He injured the

his arx

(12

643

12

0.66667

Again, we see that the associative law does not hold for division.

The Dietributive Law

Other than the commutative law and the associative laws, there is another very useful law in mathematical operation. This is the distributive law,

The distributive law states that for any number a, b and

• ) = (a x

312

The above step only breaks the number 24 up into (20+ 4 )

13

13

260

52

312

13 x ( 20

=(13 X 20)

13 2 4 小

at another example

25 x 110 = 2750

Distributing

25 x 93

2750

25 over

93 and 17

2325

425

2750

25

Sum:

Once again..

this law holds, There is one. important point to be noticed when using the distributive law. In the above case . the

"Multiplicatio Operation is called: distributed over aldition ir-

. How about. Addi tion distributed over adlition " Is this law also true ?攣

For any number a,b,and that

diacuse it in the

Lesson

ENGLISH

·LESSON SIX

Most animals can swim right off the first time they go into the water. But men have to Learn. Someone who knows how to swim has to teach us. Every girl and boy should learn to awim. Swimming is a valuable sport, because a person who can swim is able to save hime

self, as well as other people, from drown- ing. We never know when we may be in danger from the water. Swimming is also a very good form of exercise. In swimming all the muscles of the body are used. Besides, it does not cost you any money. Swimming glyge great pleasure too. How nice it is to have a swim on a hot summer day? If you are a good swim- mer you can amuse yourself by diving,

g" Diving is very amusing as well as very useful. If a valueble article of youre de dropped into. the water by accident, you can get it baok. Knowing how to swim may one day save one's life. Your ebip may be wrecked on a voyage. The pleasure-boat you are in may.

may slip off the bank into a met. You

If you cannot swim, you may be drowned.It is easy to understand why swimming is so useful. There are many advantages in swimming. That is why everybody should learn to awim. COMPREHENSION

Exercise l

Answer the following questions and your answer must be based on the passage!

1. Can men swim right off the first time they

go into water?

Why is swimming a valuable sport? Does swimming cost you any money?

Why La awimming a good exeroisa? Why La diving very useful?

6. How does swiming give great pleasure ? VOCABULARY

Exercise 2.

advantages

drowning

valuable

wrecked.

danger besides muscles upset

The above words are taken from the passage Fill in each apace with one of them:

1. His excellent education gives him

on his new job.

2. All the passengers were saved from

when the ferry sank,

The ship was

She has a

in the typhoon. diamond ring.

throwing the heavy weight.

IDIOMS

1. in a hurry (hurried, in a rush)

John is in a hurry to catch the train

2. leave out (to omit)

You have left out her name in the list. count on (to depend upon)

We count on you to help us with this. make friends (to win or gain friends) During the trip Tom made friends with

everyone on the boat,

out of order(not in worting condition) The elevator was out of order. and we had. to walk to the tenth floor.

at times (sometimas, occasionally) At times he does much better work.

7. look over (to examine).

I want to look over these

I give them to the teacher,

Laes before

have time off (to have frte tine)

I expect to have the whole summer Exercise 3

Replace the underlined words by an idiom.

1. She is the kind of person who always soems

to be in a rush

Why did you omit the second your examination?

question on

3. We could not use the telephone because it

was not in working condition.. Occasionally she feels a little better but then she becomes very weak again.

He aigned the contract without.avcn.

examining it.

Don't devens on Frank to lend you any

money because he has none MODEL ANSWER (LESSON FIVE) Exercise I

1. He was seventy years old,

2. It was rounded from years of working.

3. Because they were larger than any melons

he had ever grown.

He decided to Bell them in the markot.

5. All his melons, were disappeared :

the market.

He decided to go to a vegetable etanu

7. They stopped before a

The owner of the stand:

A large number of melon stems,

10.Yes, he could.

Exercise 2

1.disappeared 2.decided 3.arrested

excellent 5.exactly 6, correspond

Exercise 3

1.look out 2. do you think of 3.made up your mind 4.for the time being 5.call off 6. get over