Tìm x $\mathbb{Z}$ 1) - 4875 + ( 1995 + 4875 ) - x =1990 2) 2796 - ( - 38 + 2796 ) - 30 - x + 37 = - ( - 37 ) 3) 16 + ( - 17 ) + x = 10 - [ - ( 17 - 3 ) - ( 5 - 8 - 1)] 4) x + 44 + 46 + 48 - 24 - 26 - 48 = 50 - 949 - 9 5) x + ( 6785 - 86 ) - 6785 = 20 + ( - 86 + 14 ) 6) x + 27 + ( 19 ) - 75 = 8 - ( + 75 )

Đáp án`+`Giải thích các bước giải`:`

`1) - 4875 + ( 1995 + 4875 ) - x =1990`

`-4875+6870-x=1990`

`1995-x=1990`

`x=1995-1990`

`x=5`

` 2)2796 - ( - 38 + 2796 ) - 30 - x + 37 = - ( - 37 )`

`2796-2758-30-x+37=37`

`45-x=37`

`x=45-37`

`x=8`

`3) 16 + ( - 17 ) + x = 10 - [ - ( 17 - 3 ) - ( 5 - 8 - 1)]`

`-1+x=10-[-14+4]`

`-1+x=10+10`

`-1+x=20`

`x=-20+1`

`x=-19`

`4)x + 44 + 46 + 48 - 24 - 26 - 48 = 50 - 949 - 9`

`x+40=-908`

`x=-908-40`

`x=-948`

`5) x + ( 6785 - 86 ) - 6785 = 20 + ( - 86 + 14 )`

`x+6699-6785=20-72`

`x-86=-52`

`x=-52+86`

`x=34`

`6)x + 27 + ( -19 ) - 75 = 8 - ( + 75 )`

`x-67=-67`

`x=-67+67`

`x=0`