Tìm x a) x - 5/6=16/42 + -8/56 b) x/5= 5/6 + -19/30 c) x/15= 3/5 + -2/3 d) 11/8 + 13/6= 85/x e) x- (-6)/15= 4/27

Đáp án + Giải thích các bước giải:

`a,`

`x-5/6=16/42+(-8)/56`

`x-5/6=16/42-8/56`

`x-5/6=5/21`

`x=5/21+5/6`

`x=15/14`

Vậy `x=15/14`

$\\$

`b,`

`x/5=5/6+(-19)/30`

`x/5=5/6-19/30`

`x/5=1/5`

`x=1`

Vậy `x=1`

$\\$

`c,`

`x/15=3/5+(-2)/3`

`x/15=3/5-2/3`

`x/15=(-1)/15`

`x=-1`

Vậy `x=-1`

$\\$

`d,`

`11/8+13/6=85/x`

`85/24=85/x`

`24=x`

Vậy `x=24`

$\\$

`e,`

`x-(-6)/15=4/27`

`x+6/15=4/27`

`x=4/27-6/15`

`x=(-34)/135`

Vậy `x=(-34)/135`

`a,`

`x-5/6=16/42+(-8)/56`

`->x-5/6=5/21`

`->x=5/21+5/6`

`->x=15/14`

Vậy, `x=15/14`

`b.`

`x/5=5/6+(-19)/30`

`->x/5=1/5`

`->x=1`

Vậy, `x=1`

`c,`

`x/15=3/5+(-2)/3`

`->x/15=(-1)/15`

`->x=-1`

Vậy, `x=-1`

`d,`

`11/8+13/6=85/x`

`->85/24=85/x`

`->24=x`

Vậy, `x=24`

`e,`

`x-(-6)/15=4/27`

`->x+6/15=4/27`

`->x=4/27-6/15`

`->x=(-34)/135`

Vậy, `x=(-34)/135.`