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25 tháng 2 2020

Tình P = (x-4)^(x-5)^(x-6)^(x+6)^(x+5)  với x =7

25 tháng 2 2020

Ta có a1 +a2+...+a20 <0 
Lại có a2+a3+a4 >0;
          a5 +a6+a7 >0;
          a8+a9+a10>0;
          a11+a12+a13>0;
          a15+a16+a17>0;
          a18 +a19+a20>0;
          a1>0
          => a14<0;
Lại có a1+a2+a3 >0;
           a4+a5+a6>0;
            ....
            a10+a11+a12>0;
             a15+a16+a17>0;
             a18+a19+a20>0;
             => a13+a14<0;
              mà a12+a13+a14>0;
              =>a12>0;
              => a1.a12>0;
               a1.a14+a14.a12<0;
               =>a1.a14+a14.a12<a1.a12

25 tháng 2 2020

[nay]

BT Rewirte the sentences with the same meaning 1 Linda doesn"t live with her parent any moreLinda.............................................................2 My hair is now much longer than that in  the pastIn the past my hair .................................................3 He is not a poor man any more but he becomes a rich businessmanHe used .............................................................................................4 Did you often go to the beach when you lived in Nha...
Đọc tiếp

BT Rewirte the sentences with the same meaning 

1 Linda doesn"t live with her parent any more

Linda.............................................................

2 My hair is now much longer than that in  the past

In the past my hair .................................................

3 He is not a poor man any more but he becomes a rich businessman

He used .............................................................................................

4 Did you often go to the beach when you lived in Nha Trang ?

Did you used .............................................................................

5 Mr and Mrs Smith are flying to Ha Noi now.                      TRAVELLING

........................................................................................................

6 Van had a motorbike once, but he doesn"t have any more                      USED

...........................................................................................

7 My father usually goes to work by ca                                             DRIVES

.......................................................

8 This part of the city didn"t have traffic jams very often             USE

.........................................................................................

9 I used to walk to school when I was young                       FOOT

...................................................................................................................

 

 

3

1) Linda used to lived with her parents but now she doesn't 

2) In the past my hair was longer

3)He used to be a poor man the the past

4)Did you used to go to the beach when you lived in Nha Trang?

5)Mr and Mrs Smith are travelling to Ha Noi by plane

6)Van used to have a motorbike

7) My father used to drive to work

8) This part of the city isn't used to have traffic jams

9) I used go on foot to school when i was young

có j sai sót mong bỏ qua

#Học-tốt

25 tháng 2 2020

cảm ơn nha 

25 tháng 2 2020

1. My father used to swim in the pool near his house when he was a boy

2. There used to be many green trees in front of my house

3. I used to stay up late to watch football matches last year 

Cho mình xin k nha :33

25 tháng 2 2020

a. c(x)=x5−2x3+3x4−9x2+11x−6−(3x4+x5−2x3−8−10x2+9x)

c(x)=x2+2x+2

b. Để c(x)=2x+2 thì x2=0⇒x=0

c. Với c(x)=2012, ta có:

c(x)=x2+2x+2=(x+1)2+1=2012

⇔(x+1)2=2011⇒x+1∉ZxZ

25 tháng 2 2020

1 : Now there are more cars on the road than before

2 : My brother used to be a professor at HN university some years ago,but now he is an enginneer

3 : Linh used to walk to school some years ago , but now she cycles there

                                                                                                         NHỚ K CHO MK NHÉ ~ HC TỐT ~

25 tháng 2 2020

1 : Now there are more cars on the road than before

2 : My brother used to be a professor at HN university some years ago,but now he is an enginneer

3 : Linh used to walk to school some years ago , but now she cycles there

                                                                                                         NHỚ K CHO MK NHÉ ~ HC TỐT ~