(-3p^4-5k^6)^2=(-3p^4-5k^6)(-3p^4-5k^6)=
=9p^8+15k^6p^4+15k^6p^4+25k^12=
=9p^8+30k^6p^4+25k^12
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!
1,8х+6х²=0
х(1,8+6х)=0
х=0 или 1,8+6х=0; 6х=-1,8; х= -0,3
Ответ:-0,3; 0
<span>3cos(П-B)-3sin(П/2+B)/cos(B-3П)=-3cosb-3cosb\(-cosb)=-6cosb\(-cosb)=6</span>