Giải hộ tôi toán hợp lí

Bài `1:`

`a) 5/13+(-7)/13-1/13`

`= (5+(-7) -1)/13`

`= (-3)/13`

`b) 1/2+((-1)/2+4/5)`

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

`= 0+4/5`

`= 4/5`

`c) 1/4+3/4:(-6/7)`

`= 1/4 + 3/4*(-7/6)`

`= 1/4-7/8`

`= 2/8-7/8`

`= -5/8`

`d) (-5)/12*2/11+(-5)/12*9/11+(-5)/12`

`= (-5)/12 * (2/11+9/11+1)`

`= (-5)/12*2`

`= -10/12=-5/6`

`e) (-3)/5 :7/5 -3/5 :7/5 + 2 3/5`

`= (-3)/5 * 5/7 - 3/5 * 5/7 + 13/5`

`= 5/7*(-3/5-3/5) +13/5`

`= 5/7*(-6/5) +13/5`

`= -6/7+13/5`

`= 61/35`

`f) 0,75-(2 1/3+0,75) +3^2*(-1/9)`

`= 0,75 - 2 1/3 - 0,75 + 9 * (-1/9)`

`= 0,75 - 7/3-0,75-1`

`= (0,75-0,75) -7/3-1`

`= -7/3-1`

`= -10/3`

`\bbcolor{maroon}{ღJF∆┆PH◉NGღ}`