Помогите пожалуйста, вроде просто, а не получается(

ответ должен быть (-бесконечности; 1 1/3)

(2,5x+3)*(4x-1)-2,5x*(4x+2)<3

Один из углов ромба равен 56 градусов .Найдите градусные меры углов, которые образует сторона ромба с его диагоналями.

Из данных формул, выписать лишь те, которые относятся к веществам с одинаковым видом химической связи. Назвать вещества и вид их химической связи.
N2, NH3, H2, Mg3N2.

электрон влетает в однородное магнитное поле индукция которого 0,5 Тл со скоростью 20000 км / с перпендикулярно линиям индукции. определить силу, с которой магнитное поле действует на электрон СРОЧНО

Розкрийте дужки, вживаючи потрібний час дієслова: 1 I knew they(to wait) for me at the metro station and i decided to hurry. 2 I didn t know that you already (to wind) up the clock. 3I was afraid that the little girl (not to be) able to unclok the gront door and (to go) upstairs to help her. 4 He says that he (to know) the laws of the country. 5Sarie understood why Lany (not to come) the previous evtning. 6 She asked me whether l( to remember) the ledend about a faithful lion. 7 He understood that the soldiers ( to arrest) him. 8 He could not understand why people (not to want) to take water from that well. 9 i suppose they (to send) a dog after the book. 10 He said he (to leave) tomorrow morning. 11 She said she already (to find) the book. 12 He stopped and listened: the clock (to strske) five. 13She said she (can) not tell me the right time? her watch(to be0 wrong. 14 I asked my neighbour if he ever (totravel) by air before. 15 the policeman asked George where he ( to run) so early. 16 The delegates were told that the guide just (to go) out and (to be) back in ten minutes.