а) 5х^2+14х-3=0

б)4х^2=16

 

Раскройте скобки, употребляя: PresentC, PresentS, PastS или FutureS. 1. He (to spend) Ответ last summer in the country. 2. He (not to spend) Ответ last summer in the country. 3. (he to spend) Ответ last summer in the country? 4. (to spend he where) Ответ last summer? 5. She (to help) Ответ mother yesterday. 6. She (not to help) Ответ moth­er yesterday. 7. (to help she) Ответmother yesterday? 8. (how to help she) Ответmother yesterday? 9. Kate (to cook) Ответ dinner every day. 10. Kate (to cook) Ответdinner tomorrow. 11. Kate (to cook) Ответ dinner now. 12. Kate (to cook) Ответ dinner yesterday. 13. I (not to eat) Ответ ice-cream every day. 14. I (not to eat) Ответice-cream now, 15. I (not to eat) Ответ ice-cream tomorrow. 16. I (not to eat) Ответ ice-cream yesterday. 17. (you to go) Ответ to school every day? 18. (you to go) Ответ to school now? 19. (you to go) Ответ to the south next summer? 20. (you to go) Ответabroad last summer? 21. (your to do brother what) Ответ every day? 22. (to do what your brother) Ответ now? 23. (your brother to do what) Ответ tomorrow? 24. (brother what your to do) Ответ yesterday?

Решите плиз:

90*10^3

_______

460*20     

АВ - диаметр окружности, АС - ее хорда. Из точки В проведена касательная к окружности, пересекающая прямую АС в точке D. Найдите увеличенную в 3 раза длину отрезка AD, если известно, что АВ=10, а расстояние от точки В до прямой АD равно 8.