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Найдите предложения в Present Perfect и Present Perfect Continous. _
People have always been exploring the world. After many successful space flights,the Earth seems to be known completely. But still some parts of it are full of mystery.
In the western Atlantic Ocean, there is a very strange place. Lots of ships, boats and even planes have disappeared in this area. That part of the ocean is called the Bermuda Triangle.
People have been puzzled by it for years. Scientists have suggested a lot of various explanations for the Bermuda Triangle. They try to explain why that part of the world is so dangerous and unpredictable.

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mmrkrolik
mmrkrolik
4,7(83 оценок)
People have always been exploring; lost of ships,boats and even planes have disappeared; people have been puzzled;scientists have suggested
nata524
nata524
4,4(16 оценок)
|x|  +  y^2  +  z^2  -  2y  +  4z  +  5  =  0 |x|  +  y^2  -  2y  +  1  +  z^2  +  4z  +  4  =  0 |x|  +  (y  -  1)^2  +  (z  +  2)^2  =  0 |x|  > =  0    при  любом  х (y  -  1)^2  > =  0  при  любом  y (z  +  2)^2  > =  0  при  любом  z сумма  трёх  неотрицательных  выражений  равна  нулю,  когда  каждое  из них  равно  нулю. x  =  0,    y  -  1  =  0  >   y  =  1,    z  +  2  =  0  >   z  =  -2 ответ.      x  =  0,     y  =  1,     z  =  -2

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