1+2-3-4+5+6-7-8+9+10-11-12+13+98-99-100+101+102
ủa tính nhanh hay tính giá trị biểu thức hay tính thường dợ bên đó
1+2-3-4+5+6-7-8+9+10-11-12+13+98-99-100+101+102 = 103
1+2-3-4+5+6-7-8+9+10-11-12+13+98-99-100+101+102
= 1 + (2-3-4+5)+(6-7-8+9)+(10-11-12+13)+(98-99-100+101)+102
= 1 + 0 + 0 + 0 + 0 +102
= 103
1. to buy
2. wash
3. staying
4. to finish
5. to finish
6 go
7. play
8. telling/ to tell
9. to be
10. to use
11. visit
12. cooking
13help
14. to see
C.Complete the form of the verbs in parentheses:
1.They want (buy)............to buy..........some meat.
2.You must (wash)...........wash...........your hands before meals.
3.I am used to (stay)............staying..........up late.
4.It takes him 2 hours (finish)..........to finish............this exercise.
5.The test is too difficult for the pupils (finish)...........to finish...........in time.
6.He asked me (go)...........to go...........with him.
7.They let him (play)...........play...........here.
8.It’s no use (tell)............telling..........him (tell)...........to tell...........the truth.
9.You had better (be)..........be............there on time.
10. The man shows us how (get)..........to get............to the railway station.
11. I used to (visit)...........visit...........Nha Trang.
12. Mai is busy (cook)...........cooking...........in the kitchen.
13. It’s very kind of you (help).......to help........me.
14. This film is interesting enough for me (see).............to see............it again.
Chúc bạn học tốt!
Tính giá trị biểu thức:
A = 1-3+5-7+9-11+13-15+...+97-99+101
B=1-2-3-4+5-6-7-8+9-10-11-12+...+97-98-99-100
Give the correct form of the words in brackets.
1. I have little.....of going abroad this year. (EXPECT)
1. expectation
2. swimming
3. writing
4. odorous
5. service
6.attentively
7. troublesome
8. noticeable
9. fixings
10. unforgiveable
11. argument
12. appearance
15. inconvenience
I. Complete the form of the verbs in parentheses:
1.They want(buy) ............ some meat.
2.I am used to(stay) ............ up late.
3. It takes him 2 hours (finish)............this exercise.
4.The test is too difficult for the pupils (finish) ..........in time.
5. He asked me(go) ............with him
6. They let him(play) ...........here.
7.It's no use(tell) .......... him (tell).............. the truth
8. You had better(be) ........... there on time.
9. The man shows us how(get) ............. to the railway station.
10. I used to(visit)....... Nha Trang.
11. Mai is busy(cook).........in the kitchen.
12.It's very kind of you(help)........me.
13.This film is interesting enough for me(see).......it again.
14.Mai isn't old enough (see) ............ horror films.
Nhờ các bạn làm giúp mình.
1.They want(buy) .....to buy....... some meat.
2.I am used to(stay) ....stay........ up late.
3. It takes him 2 hours (finish).....to finish.......this exercise.
4.The test is too difficult for the pupils (finish) .......to finish...in time.
5. He asked me(go) .....going.......with him
6. They let him(play) ......play.....here.
7.It's no use(tell) ......to tell.... him (tell)......telling........ the truth
8. You had better(be) ....were....... there on time.
9. The man shows us how(get) ....to get......... to the railway station.
10. I used to(visit)....visit... Nha Trang.
11. Mai is busy(cook)....in cooking.....in the kitchen.
12.It's very kind of you(help)...to help.....me.
13.This film is interesting enough for me(see)..to see.....it again.
14.Mai isn't old enough (see) ......to see...... horror films.
1.They want(buy) ......to buy...... some meat.
2.I am used to(stay) ...staying......... up late.
3. It takes him 2 hours (finish).....to finish.......this exercise.
4.The test is too difficult for the pupils (finish) .....to finish.....in time.
5. He asked me(go) ......to go......with him
6. They let him(play) ....play.......here.
7.It's no use(tell) ....to tell...... him (tell)......to tell........ the truth
8. You had better(be) ....be....... there on time.
9. The man shows us how(get) ........to get..... to the railway station.
10. I used to(visit)..visit..... Nha Trang.
11. Mai is busy(cook)...to cook......in the kitchen.
12.It's very kind of you(help)..to help......me.
13.This film is interesting enough for me(see)..to see.....it again.
14.Mai isn't old enough (see) .....to see....... horror films.
I. Complete the form of the verbs in parentheses:
1.They want(buy) ............ some meat.
2.I am used to(stay) .....stay....... up late.
3. It takes him 2 hours (finish)....to finish........this exercise.
4.The test is too difficult for the pupils (finish).......to finish...in time.
5. He asked me(go) .....to go.......with him
6. They let him(play) ....play.......here.
7.It's no use(tell) ....telling...... him (tell).......tell....... the truth
8. You had better(be) ....be....... there on time.
9. The man shows us how(get) ......to get....... to the railway station.
10. I used to(visit)...visit .... Nha Trang.
11. Mai is busy(cook)....to cook.....in the kitchen.
12.It's very kind of you(help)...to help.....me.
13.This film is interesting enough for me(see)...to see....it again.
14.Mai isn't old enough (see) ....to see........ horror films.
1 + 2 + 3 - 4 - 5 - 6 + 7 + 8 +9 - 10 - 11- 12 +..... + 97 + 98 + 99 - 100 - 101 - 102
1+2+3-4-5-6+7+8+9-10-11-12+.........+97+98+99-100-101-102
1+2+3-4-5-6+...+97+98+99-100-101-102
=(1+2+3-4-5-6)+...+(97+98+99-100-101-102) có 17 cặp số
=(-9)+(-9)....+(-9) 17 cặp số
=(-9).17=-153
1+2+3-4-5-6+7+8+9-10-11-12+...+97+98+99-100-101-102
D= 1+2+3-4-5-6+7+8+9-10-11-12+........+97+98+99-100-101-102
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiilllllllllllllllllllllllllllljjjjhhhhhhhgfheeehgt
D = 1+2+3-4-5-6+7+8+9-10-11-12+........+97+98+99-100-101-102
D = (1+2+3-4-5-6) + (7+8+9-10-11-12) + ........... + (97+98+99-100-101-102)
D = (-9) + (-9) + .......... + (-9) có 17 số -6
D = -6.(-9)
D = 54
