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


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

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

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