2;3 . Tìm Tọa độ điểm điểm B đối Xứng Với điểm A Qua Mặt Phẳng Oyz

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Câu hỏi

Trong không gian Oxyz , cho điểm A−1;2;3 . Tìm tọa độ điểm điểm B đối xứng với điểm A qua mặt phẳng Oyz . A.B1;2;3 . B.B1;2;−3 . C.B−1;−2;−3 . D.B1;−2;3 . Đáp án và lời giải Đáp án:A Lời giải:Lời giải Chọn A Hình chiếu của điểm A xuống mặt phẳng Oyz là I0;2;3 . Khi đó I là trung điểm của AB nên tọa độ điểm B1;2;3 .

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• Part 3: Questions 76 – 85 (2.0 points - 0.2/ each)

  Read the text and fill in one word which best fits each gap.

  For a long time in the past photography was not regarded (76) ………………………….. an art. It was simply a skill and it was criticized for being too mechanical and not creative enough. At last, however, photography is now accepted as a unique (77) ………………………….. very important form of art.

  The photograph's claim to be (78) ………………………….. objective record of reality is now seriously challenged, and the important function of photography in modern-day society is consequently (79) ………………………….. threat. The threat has suddenly become all the more serious as more and more photographers are turning to the new technology offer (80) ………………………….. computers offer. Moreover, an increasing (81) ………………………….. of colleges have now begun to courses in computer imaging. All these developments raise a disturbing question. Is photography, as we know it dead?

  In (82) ………………………….. of its complete transformation by new technological developments, however, photography will continue to play a key (83) …………………………..  in our culture. Although it may (84) ………………………….. longer claim to be realistic, modern photography can continue to provide us (85) ………………………….. fresh visual information about ourselves and the world in which we live.

  and the important function of photography in modern-day society is consequently (79) ………………………….. threat.

• Give the correct form of the verbs in the blanket

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• Part 3: Questions 76 – 85 (2.0 points - 0.2/ each)

  Read the text and fill in one word which best fits each gap.

  For a long time in the past photography was not regarded (76) ………………………….. an art. It was simply a skill and it was criticized for being too mechanical and not creative enough. At last, however, photography is now accepted as a unique (77) ………………………….. very important form of art.

  The photograph's claim to be (78) ………………………….. objective record of reality is now seriously challenged, and the important function of photography in modern-day society is consequently (79) ………………………….. threat. The threat has suddenly become all the more serious as more and more photographers are turning to the new technology offer (80) ………………………….. computers offer. Moreover, an increasing (81) ………………………….. of colleges have now begun to courses in computer imaging. All these developments raise a disturbing question. Is photography, as we know it dead?

  In (82) ………………………….. of its complete transformation by new technological developments, however, photography will continue to play a key (83) …………………………..  in our culture. Although it may (84) ………………………….. longer claim to be realistic, modern photography can continue to provide us (85) ………………………….. fresh visual information about ourselves and the world in which we live.

  The threat has suddenly become all the more serious as more and more photographers are turning to the new technology offer (80) ………………………….. computers offer.

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  (Source: https://chemicalsinourlife.echa.europa.eu/)

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