匿名
匿名 發問於 教育及參考書教學 · 9 年 前

急!急!急!數學一題!盡快回答

0.99÷_______=1.8

4 個解答

評分
  • 9 年 前
    最佳解答

    0.99÷0.55=1.8

    你可以用0.99÷1.8找答案

    資料來源:
  • 9 年 前

    Question :

    0.99÷_______=1.8

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    Way A : ( Use 方程 )

    Let the answer is y

    0.99 ÷ y = 1.8

    0.99 ÷ y x y = 1.8y

    0.99 = 1.8y

    0.99 ÷ 1.8 = 1.8y ÷ 1.8

    y = 0.55

    So , the answer is 0.55

    ---------------------------------------------------

    Way B : ( Try )

    Try the answer is 1 first .

    0.99 ÷ 1 = 0.99 ( The answer is too small , so the answer should be smaller )

    And 0.5 ,

    0.99 ÷ 0.5 = 1.98 ( The answer is too big , so the answer should be bigger )

    try 0.6 :

    0.99 ÷ 0.6 = 1.65 ( Very close , but the answer is smaller than 1.8 , so the answer should be smaller )

    0.5 < The answer < 0.6

    Try 0.53 and 0.57

    0.99 ÷ 0.53 ~ 1.87

    0.99 ÷ 0.57 ~ 1.74

    1.74 < 1.8 ( the answer ) < 1.87

    So the answer is bigger than 0.53 , but is smaller than 0.57

    Try 0.55 ,

    0.99 ÷ 0.55 = 1.8 ( Right ! )

    So the answer is 0.55

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    資料來源: Hope I Can Help You ^_^
  • 匿名
    9 年 前

    0.99÷0.55=1.8

  • 9 年 前

    0.99÷1.782=1.8

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