vt 5 số thích hợp vào dãy sau
1 ; 2 ; 4 ; 8 ;.................
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Ta thấy quy luật tích của 2 số liền trước + 2 được số liền sau
1x1+2=3
1x3+2=5
3x5+2=17
Hai số hạng tiếp theo là
5x17+2=87
17x87+2=1481
Ta có :
3 x 1 + 2 = 5
5 x 2 + 3 = 13
13 x 3 + 4 = 43
43 x 4 + 5 =177
177 x 5 + 6 = 891
891 x 6 + 7 = 5353
Vậy số cần tìm là 891
. Điền từ để hỏi thích hợp vào các câu sau
1 What time do your classes start?
At seven o’clock.
2 How many floors does your house have?
Two.
3…When does Nguyet have English?
On Wednesday and Friday.
4 Where is her classroom?
On the second floor.
5What do they do after school?
They do their housework.
6 What does his mother do?
A doctor.
7 How are the children?
They are fine.
8 Where is she?
In her room.
9How many trees are there in your school yard?
Fifteen
10Who are the boys?
Hung and Son, my students
Ex2. Sắp xếp thành câu
1. do /what/ you /time/ breakfast/ have/?
What time do you have breakfast?
2. grade/ is/ he/ which /in/?
Which grade is he in?
3. house /where/ her/ is/?
Where is her house?
4. old /is/ brother/ your/ how?
How old is your brother?
5. do/ in/ do/ the/ morning/ what/ they/?
What do they do in the morning?
6. how/ are/ in/ there/ chairs/ room/ his/ many/?
How many chairs are there in his class room?
7. does/ have/ Literature/ when/ she/?
When does she have Literature?
8. time/ start/ your/ what/ class/ does/?
What time does your class start?
9. on/ what/ Minh/ Tuesday/ have/ does/?
What does Minh have on Tuesday?
10. pencils/ Huong/ many/ does/ have/ how/?
How many pencils does Huong have?
11. you/ what/ time/ do/ school/ to/ go/?
What time do you go to school?
12. after/ what/ do/ school/ Lan/ do/ and/ brother/ her/?
What does Lan and her brother do after school?
Giải :
Ta có:
3x1+2 = 5;
5x2+3 = 13;
13x3+4= 43;
43x4+5 = 177;
177x5 + 6 = 891;
891x6 + 7 = 5353;
Do đó đáp án là 891 ;
16;32;64;128;256
16;32;64;128;256 tk mk nha