3х-1≥5х-10+11
3х-5х≥11-10+1
-2х≥2
х≤-1
1) My parnts know so much because they have already travelled a lot.
2) We haven't seen George since last year.
3) I haven't seen this film yet.
4)Alice has just met her friend.
6) The kids have just played in the yard
5) I have never spoken to our teacher.
7) We haven't decided to help him yet.
8) I haven't seen my family for a long time.
9) Have you ever ridden the scooter.
10) Sara has never been snorkelling. She is so inactive!
Я немного не поняла второе задание,но если ты мне объяснишь что нужно сделать,то я дополню
1)(ctg^2альфа +1)хSin^2альфа-cos^2альфа= 1/Sin^2альфа х Sin^2альфа-cos^2альфа = -cos^2альфа
X²+3/5x=10-1/2x-3x²+8/14x
4x²+(3/5+1/2-8/14)x=0
4x²+37/70x=0
x(4x+37/70) x1=0 4x=-37/70 x2=37/280