Giúp em vs ạ em cảm ơn a/c nhanh giúp em ạkk

Đáp án `+` Giải thích các bước giải:

1.

1) `(12/32 + 5/(-20) - 10/24) : 2/3`

`= (3/8 - 1/4 - 5/12) .  3/2`

`= (9/24 - 6/24 - 10/24) . 3/2`

`= (-7)/24 . 3/2`

`=(-7)/16`

2) `4 1/2 : (2,5 - 3 3/4) + (-1/2)^2`

`= 9/2 : (25/10 - 15/4) + 1/4`

`= 9/2 : (5/2 - 15/4) + 1/4`

`= 9/2 : (10/4 - 15/4) + 1/4`

`= 9/2 : (-5)/4 + 1/4`

`= 9/2 . (-4)/5 + 1/4`

`= (-18)/5 + 1/4`

`= (-72)/20 + 5/20`

`= (-67)/20.`

3) `(-17)/30 - 11/(-15) + (-7)/12`

`= (-17)/30 + 11/15 + (-7)/12`

`= (-17)/30 + 22/30 + (-7)/12`

`= 1/6 + (-7)/12`

`= 2/12 + (-7)/12`

`= (-5)/12`

4) `(-5)/9 + 5/9 : (1 2/3 - 2 1/12)`

`= (-5)/9 + 5/9 : (5/3 - 25/12)`

`= (-5)/9 + 5/9 : (20/12 - 25/12)`

`= (-5)/9 + 5/9 : (-5)/12`

`= (-5)/9 + 5/9 . (-12)/5`

`= (-5)/9 + (-4)/3`

`= (-5)/9 + (-12)/9`

`= (-17)/9.`

5) `(-7)/25 . 11/13 + (-7)/25 . 2/13 - 18/25`

`= (-7)/25 . (11/13 + 2/13) - 18/25`

`= (-7)/25 . 13/13 - 18/25`

`= (-7)/25 . 1 - 18/25`

`= (-7)/25 - 18/25`

`= (-25)/25 = -1.`

2.

1) `4/7x + 2/3 = (-1)/5`

`4/7x = (-1)/5 - 2/3`

`4/7x = (-3)/15 - 10/15`

`4/7x = (-13)/15`

`x = (-13)/15 : 4/7`

`x = (-91)/60.`

2) `2/9 - 7/8x = 1`

`7/8x = 2/9 - 1`

`7/8x = 2/9 - 9/9`

`7/8x = (-7)/9`

`x = (-7)/9 : 7/8`

`x = (-7)/9 . 8/7`

`x = (-8)/9.`

3) `4/5 + 7/6 : x = 1/6`

`7/6 : x = 1/6 - 4/5`

`7/6 : x = 5/30 - 24/30`

`7/6 : x = (-19)/30`

`x = 7/6 : (-19)/30`

`x = 7/6 . (-30)/19`

`x = (-35)/19.`

4) `6/7 : x - 1 = 2/3`

`6/7 : x = 2/3 + 1`

`6/7 : x = 2/3 + 3/3`

`6/7 : x = 5/3`

`x = 6/7 : 5/3`

`x = 6/7 . 3/5`

`x = 18/35.`