троллейбус движущийся со скоростью 36 км/ч останавливается при торможении в течении 4 с. С каким постоянным ускорением движется  он при торможении?

Раскройте скобки, употребляя глаголы в требующемся времени.

1. Where is your luggage? I (to leave) it at the station. I (to take) it tomorrow when Nick (to come) to help me. 2. I (to read) about an hour when he (to come). 3. The play (not yet to begin) and the people (to talk) in the hall. 4. Yesterday I (to buy) a new pair of gloves, as I (to lose) the old ones. 5. We (to walk) in silence. He already (to tell) me all that (to be) interesting about himself, and I (to have) nothing to tell him. 6. The moon (not to rise) yet, and only two stars, like two distant lighthouses, (to shine) in the dark blue sky. 7. One night a little swallow (to fly) over the city. His friends (to fly) away to Egypt six weeks before, but he (to stay) behind. 8. What you (to do) these three months? 9. Our train starts late in the evening, so if you (to come) at seven o'clock, we still (to pack) our luggage. 10. When you (to see) him last? 11. I (to meet) him when he (to walk) across the park. 12. You ever (to act) on the stage? Why, yes, that's what I (to do) for the last six years. 13. Don't enter the bedroom! The child (to sleep) there, and he always (to wake) up when somebody (to open) the door.

 Как решить уравнение ?

 [tex]\frac{6}{x^2-2x}-\frac{12}{x^2+2x}=\frac{1}{x}[/tex]