tìm x a, $\frac{12}{7}$ : x + $\frac{2}{3}$ = $\frac{7}{5}$ b,16 : [($\frac{3}{5}$ . x + 8 ) : 21 + 9 ] = $\frac{7}{10}$

tìm x
a,
$\frac{12}{7}$ : x + $\frac{2}{3}$ = $\frac{7}{5}$
b,16 : [($\frac{3}{5}$ . x + 8 ) : 21 + 9 ] = $\frac{7}{10}$

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  1. a) `12/7 : x + 2/3 = 7/5`

        `12/7 : x = 7/5 – 2/3`

        `12/7 : x = 11/15`

        `x = 12/7 : 11/15`

        `x = 12/7 . 15/11`

        `x = 180/77`

    b) `16 : [(3/5 . x + 8) : 21 + 9] = 7/10`

        `[(3/5 . x + 8) : 21 + 9] = 16 : 7/10`

        `(3/5 . x + 8) : 21 + 9 = 160/7`

        `(3/5 . x + 8) : 21 = 160/7 – 9`

        `(3/5 . x + 8) : 21 = 97/7`

        `3/5 . x + 8 = 97/7 . 21`

        `3/5 . x + 8 = 97/147`

        `3/5 . x = 97/147 – 8`

        `3/5 . x = -1079/147`

        `x = -1079/147 : 3/5`

        `x = -5395/441`

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