Question

\(a,\dfrac{-2}{3}.\left[\left(7,2-\dfrac{2}{5}\right).x-\dfrac{3}{13}\right]=1\dfrac{1}{15}\)

Answer 1

`(-2)/3 . [ (7,2 - 2/5) . x - 3/13] = 1 1/15`

`(-2)/3. [ (36/5 - 2/5) . x - 3/13] = 1 1/15`

`(-2)/3 . [34/5 . x - 3/13] = 16/15`

`34/5 . x - 3/13 = 16/15 : (-2)/3`

`34/5 . x - 3/13 = 16/15 xx (-3)/2`

`34/5 . x - 3/13 = (-8)/5`

`34/5 . x = (-8)/5 + 3/13`

`34/5 . x = (-89)/65`

`x=(-89)/65 : 34/5`

`x = (-89)/65 xx 5/34`

`x=(-89)/442`

Vậy `x=(-89)/442`

Answer 2

`-2/3 * [(7,2 - 2/5) * x -3/13] = 1 1/15`

`<=> -2/3 * [(36/5 - 2/5 )*x - 3/13 ] = 16/15`

`<=>  [(36/5 - 2/5 )*x - 3/13 ] = 16/15 : (-2/3)`

`<=>34/5 *x - 3/13 = -8/5`

`<=> 34/5* x = -8/5 + 3/13`

`<=>  34/5* x = =-89/65`

`<=> x = -89/65 : 34/5 = -89/442`

Answer 3