Представьте двучлен 3х-y   в виде дроби со знаменателем,равным  9х+y  

Скласти речення з поданих слів:

1) Scientists, today, many, a lot of, do, research.

2)Energy, for, must, atomic, purposes, only, be, peaceful, used.

3) Reactors, nuclear, much, all, of, making, over, devote, time, to the problem, lighter, scientists, the world.

4) Nature, changes, and, physical, take place, in chemical, thousand of.