dat a=x²

suy ra p/t tuong duong 

2a²-17a-9=0

giai phuong trinh ta duoc hai nghiem: 9 ;-1/2

vi dat nhu tren nen a khong nhan gia tri am nen -1/2 (loai)

 a=9 nhan

suy ra x²=9

suy ra x=-3 hoac x=3 

 nhan ca hai nghiem

dễ trong sách giáo khoa có đó

885 nhé bạn

Choose the best answer.

If you have any questions, please _________ your hand.

A. raising 

B. raised 

C. raise 

D. put down

tổng 6 số là:

4x6=24

tổng của 7 số là

5x7=35

số thứ 7 là

35-24=11

Similer meaning

1.The living room is not as big as the kitchen (than)

->The kitchen room is bigger than the living room

2.The box is very heavy, so I can't lift it. (too)

->The box is too heavy for me to lift

3. He asked me, ''How are you today?''.(if)

->He asked me how I was that day.

4.We like driving in the country.(funny)

->It is funny to drive in the country

5.The last time I saw him was 1999(since)

->I haven't seen him since 1999.

6.When did you begin to learn English?(learn)

->How long have you learned English?

7.''See the doctor'', Mary siad to me.(adised)

->Mary advised me to see the doctor

8.Where is the nearest bank?(tell)

->Could you tell me how to get to the nearest bank?

9.He climbed the tree because he wanted to get a better view.(in order to)

->He climbed the tree in order to get a better view.

10.Traveling aroung the city in a day is impossible(to)

->It is impossible to travel around the city in a day.

I : Vt lại câu sau sao cho nghĩa ko đổi

1: Lan always does the housework

Lan gets....used to doing the housework ......

x - 23 = 76

x       = 23 + 76

x       = 99

I : Rewrite the sentences

1: Playing sports is our favorite pastime

We .......like playing sports in our pastime .........

2: I think we should work harder for these day to please our teacher

What .....about working harder for these days to please our teacher?........

198*10=1980

bạn ơi lớp 2 chưa học đến bài này đâu!bài này là toán lớp 4 đấy