Реферат на тему новейшее время-трудный шаг к единому человечеству.

1.vstav missing words in the text1) period of time started with carrying all of humanity , and at the same time era ) the twentieth century was rich with new discoveries and inventions , such as : 3) at the same time the twentieth century - the era of hardship for humanity, such as: 2 . litter "+" sign deals that say about the era newest time .people first saw and photographed our planet from space.columbus discovered americasome states got into the hands of a terrible power - nuclear weapons capable of destroying the entire planetthere are state , dreaming of world dominationmade such inventions as the telescope, microscope , balloonall of us - one of human civilization . 1. period of the latest start time of the first world war 1914-1918 , carriers benefit all humanity , while the era of the world wars and hardships . 2 people have learned to use nuclear energy , people have learned to make cars invented the jet engine, televisions, computers . 3 first and second world war . 4.nekotorye state hands got a terrible power - nuclear orzhie capable of destroying the entire plan

a) 1/2 или 0,5

b) -31/9  или -3,4

Пошаговое объяснение: