# 急!急!急!數學一題!盡快回答

0.99÷_______=1.8

### 4 個解答

• 10 年 前
最佳解答

0.99÷0.55=1.8

你可以用0.99÷1.8找答案

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• 10 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

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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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• 匿名
10 年 前

0.99÷0.55=1.8

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• 10 年 前

0.99÷1.782=1.8

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