Vote 5* hlepppppppppp

Đáp án `+`Giải thích các bước giải:

1)

a) `5/15 - 6/12 + (-1)/3`

`= 1/3 - 1/2 + (-1)/3`

`= (1/3 + (-1)/3) - 1/2`

`= 0 - 1/2`

`= -1/2.`

b) `(3/19 + 16/23) - (3/19 - 7/23)`

`= 3/19 + 16/23 - 3/19 + 7/23`

`= (3/19 - 3/19) + (16/23 + 7/23)`

`= 0 + 23/23`

`= 0 + 1`

`= 1.`

c) `(-5)/9 + 17/13 + 4/(-9) + 5/(-4) + 9/13`

`= ((-5)/9 + (-4)/9) + (17/13 + 9/13) + 5/(-4)`

`= (-9)/9 + 23/23 + (-5)/4`

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

`= 0 + (-5)/4`

`= (-5)/4.`

2)

a) `2/3 - x = (-3)/9`

`2/3 - x = (-1)/3`

`x = 2/3 - (-1)/3`

`x = 3/3`

`x = 1.`

b) `(3/4 - x) - 7/18 = 11/18`

`3/4 - x = 7/18 + 11/18`

`3/4 - x = 18/18`

`3/4 - x = 1`

`x = 3/4 - 1`

`x = -1/4.`

c) `(11/(-2) + x) - 1/3 = 7/8`

`(-11)/2 + x = 1/3 + 7/8`

`(-11)/2 + x = 8/24 + 21/24`

`(-11)/2 + x = 29/24`

`x = 29/24 - (-11)/2`

`x = 29/24 + 132/24`

`x = 161/24.`