A rectangular garden has length of x (dm) and area of 252 $dm^{2}$. If the width is 5 cm less than one – third of the length, then the perimeter of t

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A rectangular garden has length of x (dm) and area of 252 $dm^{2}$. If the width is 5 cm less than one – third of the length, then the perimeter of this garden is ……. dm

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  1. Đáp án:

     

    Giải thích các bước giải:

     the width of the garden is x/3-5 

    because area of this garden is 252 , we have 

    x (x/3-5) = 252 

    1/3x ^2 – 5x – 252 =0 

    => x = 36 dm

    the width of the garden 

    36/3-5 =7 (dm )

    the perimeter (36+7)x2 =84 dm

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  2. The width of the garden is: `x/3` `-` `5` ( dm )

    According to the threads we have:

          `x(x/3-5)“=`252`

    `⇔` `1/3x^2“-“5x“-“252“=“0`

    `⇔`  `x=36` ( dm )

    `⇔` The width of the garden is: `36/3“-“5“=“12“-“5“=“7` ( dm )

    `⇔` The perimeter of this garden is: `(36+7).2“=“84` ( dm )

    @ chú lân

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