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Frank asked in 社會與文化語言 · 1 decade ago




4 Answers

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    After buying a 380-dollar story book, Da-Bao could buy four 15-dollar

    mechanical pencils. How much money did Da-Bao have in the beginning?


    Answer: 440 dollars



    A triangle has a side whose length is 5, and the lengths of the other two sides

    of it are both the integers and the sum of them is 9. Then, how many kinds of the triangle

    are there?

    9-x >=x → x <=4.5

    5+x >9-x → x >2

    5+(9-x) >x → x <7

    x+(9-x) >5 → 9 >5

    x=3 or 4

    Answer: 2 kinds

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  • 1 decade ago

    1. After Da Bou buying a storybook for $380, the money that he has left can be used to buy 4 pencils at $15 each. How much does Da Bou have at the very beginning?

    2. If one side of the triangle is 5 units, the other 2 sides are whole numbers and add up to 9 units. How many different types of triangles are there?

    Source(s): 在國外當數學老師的我
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  • 1 decade ago

    第一題:因為題目沒說買完自動鉛筆後的錢是否剛好花完,所以列式為: 380+15x4小於等於(大寶原有多少錢)小於等於380+14+15x4(因最多剩14元) 整理後=440小於等於(大寶原有多少錢)小於等於454

    第2題:3,5,6 和 4,5,5 兩種可能

    Source(s): 自己
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  • 1 decade ago

    1) after Da Bao bought a 380 story book, the money he had left can still buy 4 pencil that is 15 dollar per each, how much do Da Bao have before he didn't buy anything?

    2) if one side of a triangle is 5 another two side is same length, totally equal to nine, how many types of this kinf of triangle are there?


    Source(s): 國外讀書的自己
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