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a) x2(5x3 – x -1/2) = x2. 5x3 + x2 . (-x) + x2 . (-1/2)
= 5x5 – x3 – 1/2x2
b) (3xy – x2 + y)2/3x2y = 2/3x2y. 3xy +2/3x2y. (- x2) + 2/3x2y. y
= 2x3y2 – 2/3x4y + 2/3x2y2
c) (4x3– 5xy + 2x)(-1/2xy) = -1/2xy . 4x3 + (-1/2xy) . (-5xy) + (- 1/2xy) . 2x
= -2x4y +5/2x2y2 – x2y.
| 1. | A. grammar | B. damage | C. mammal | D. drama | ||||
| 2. | A. both | B. tenth | C. myth | D. with | ||||
| 3. | A. gate | B. gem | C. gaze | D. gaudy | ||||
| 4. | A. thus | B. thumb | C. sympathy | D. then | ||||
| 5. | A. lays | B. says | C. stays | D. plays |
3/2: February, the third or the third of February
20/11: November, the twentieth
2/9: September, the second
31/10: October, The thirty - first
1/1: January, the first
8/3: March, the eighth
26/3: March, the twenty - sixth
30/4: April, the thirtieth
1/5: May, the first
25/12: December, The twenty - fifth
1. Choose the best answer for each of the following sentences
-/ I wonder ......... your brother looks like
1. what 2. how 3. why 4. who
-/ I hope you'll concentrate.......... your pronnunciation
1.for improving 2. on improving 3.to improve 4. to improving
-/ I don't blame you for not....... outside in this awful weather
1. wanting to go 2. wanting go 3. want to go 4. to want
-/ He .....to give the explanation why be was late
1. denied 2. objected 3. refused 4.disliked
-/Every means....., but without good result
1. have been tried 2. have tried 3. has been tried 4. has tried
-/ I was enjoy my book , but I stopped.......my homework
1.reading to do 2. to read to do 3.to read for doing 4.reading for do
-/ He 'd like to ........ the crossword puzzle in the newspaper every day
1. fill 2. make 3. answer 4. do
-/ Our neighbours are very .... on camping holidays
1. eager 2. enthusiastic 3. interested 4. keen
-/ Before he left school , his father told him to start thinking about choosing a ........
1.profession 2. carrer 3. work 4.occupation
-/ We are ...... him to arrive at any moment
1.wishing 2. hoping 3. expecting 4. waiting
1. A. Kicked B. Fixed C. Pleased D. Missed
3. A. Amount B. Count C. Mountain D. Course
4. A. Reasonable B. Threaten C. Release D. Keenness
5. A. Cities B. Workers C. Series D. Satellites