Đáp án + Giải thích các bước giải:
`a, 4/3 - ( x - 1/5 ) = / -3/10 + 1/2/ - 1/6`
`4/3 - (x - 1/5) = | 1/5 | - 1/6`
`4/3 - (x - 1/5) = 1/5 - 1/6`
`4/3 - (x - 1/5) = 1/30`
`x - 1/5 = 4/3 - 1/30`
`x - 1/5 = 13/10`
`x = 13/10 + 1/5`
`x = 3/2`
Vậy `x = 3/2`
`(3/4 x - 10,2) : 3 = 1 7/8 - 80%`
`(3/4 x - 51/5) : 3 = 15/8 - 4/5`
`(3/4 x - 51/5) : 3 = 43/40`
`3/4 x - 51/5 = 43/40 . 3`
`3/4 x - 51/5 = 129/40`
`3/4 x = 129/40 + 51/5`
`3/4 x = 537/40`
`x = 537/40 : 3/4`
`x = 179/10`