Television first came in the 1950s. Nowadays, it is one of the most (1) ________ sources of entertainment for both the old and the young. Television brings (2) ________ for children, world news, music and many other (3) ________ If someone likes sports, he can just choose the right sports (4) ________. It is not difficult for us to see why (5) ________ is a TV set in almost every home today.

      1.   A cheap                       B. expressive              C. popular                   D. exciting

      2.   A news                        B. cartoons                  C. sports                      D. plays

      3.   A sets                          B. reports                    C. channels                 D. programmes

      4.   A. athletes                   B. channel                   C. time                        D. studio

      5.   A. it                             B. this                         C. that                         D. there

Find a mistake among the four underlined parts A, B, C, or D of each sentence and correct it.

      1.   We play many games at the park yesterday.

                     A                 B     C                     D

      2.   Did you watched the show last night?

            A         B         C         D

      3.   Last summer my parents buyed me a lot of different gifts.

                        A                              B              C                       D

      4.   There was many people standing on the street.

                        A                 B           C            D

      5.   Did your uncle took you to watch the football match last week?

              A                       B               C                        D

Số nào trong các số sau đây chia hết cho 3?

A) 26

B) 223

C) 109

D) 2019

a) 3x – 2 = 19

3x = 19 + 2

3x = 21

x = 21:3

x = 7

b) [43 - (56 - x)].12 = 384

43 – (56 – x) = 384:12

43 – (56 – x) = 32

56 – x = 43 – 32

56 – x = 11

x = 56 – 11

x = 45

c) 3^x.2 + 15 = 33

3^x.2 = 33 - 15

3^x.2 = 18

3^x = 18 : 2

3^x = 9

3^x = 33

x = 2.

a) 22.85 + 15.22 - 20200

= 4.85 + 15.4 – 1

= 4.(85 + 15) – 1

= 4.100 – 1

= 400 – 1

= 399

b) 50 + [65 - (9 - 4)2]

= 50 +

= 50 + [65 – 25]

= 50 + 40

= 90

c) (39 - 19) : (-2) + (34 - 22).5

= 20 : (-2) + 12.5

= -10 + 60

= 50

d) 123.456 + 456.321 – 256.444

= 456.(123 + 321) – 256.444

= 456.444 – 256.444

= 444.(456 – 256)

= 444

đáp án A

a. Tìm số tự nhiên x biết 8.6 + 288 : (x - 3)² = 50

b. Tìm các chữ số x; y để A = x183y chia cho 2; 5 và 9 đều dư 1.

c. Chứng tỏ rằng nếu p là số nguyên tố lớn hơn 3 thì p² - 1 chia hết cho 3

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