tìm x 3$\frac{1}{4}$ +$\frac{1}{4}$x=4 4$\frac{1}{5}$ -$\frac{1}{5}$ x=6

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1. Đáp án:

   `3\frac{1}{4}` `+` `\frac{1}{4}x` = `4`

   `\frac{13}{4}` `+` `\frac{1}{4}x` = `4` 

             `\frac{1}{4}x` = `4` `-` `\frac{13}{4}`

             `\frac{1}{4}x` = `\frac{3}{4}`

             `x` = `\frac{3}{4}` : `\frac{1}{4}`

              `x` = `3`

   Vậy `x` = `3`

   `4\frac{1}{5}` `-` `\frac{1}{5}x` = `6`

   `\frac{21}{5}` `-` `\frac{1}{5}x` = `6`

             `\frac{1}{5}x` = `\frac{21}{5}` `-` `6`

             `\frac{1}{5}x` = `-\frac{9}{5}`

             `x` = `-\frac{9}{5}` : `\frac{1}{5}`

             `x` = `-9`

   Vậy `x` = `-9`

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2. Đáp án:

   3$\dfrac{1}{4}$ + $\dfrac{1}{4}$$x$=4 

   $\dfrac{13}{4}$+ $\dfrac{1}{4}$ $x$=4

   $\dfrac{1}{4}$ $x$=4-$\dfrac{13}{4}$

   $\dfrac{1}{4}$$x$= $\dfrac{16}{4}$+$\dfrac{13}{4}$

   $\dfrac{1}{4}$$x$= $\dfrac{13}{4}$

   $x$= $\dfrac{13}{4}$: $\dfrac{1}{4}$ 

   $x$=13

   4$\dfrac{1}{5}$-$\dfrac{1}{5}$$x$=6

   $\dfrac{21}{5}$-$\dfrac{1}{5}$$x$=6

   $\dfrac{1}{5}$ $x$=$\dfrac{21}{5}$ -6

   $\dfrac{1}{5}$ $x$=$\dfrac{21}{5}$-$\dfrac{30}{5}$

   $\dfrac{1}{5}$ $x$= $\dfrac{-9}{5}$

   $x$= $\dfrac{-9}{5}$ : $\dfrac{1}{5}$

   $x$=9

   $\huge\text{#LunarKim}$

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