2 câu trả lời
Đáp án:
`x=4993/13`
Giải thích các bước giải:
`390-(x-7) =168 : 13`
`-> 390 -(x-7) =168/13`
`-> x -7 =390 -168/13`
`-> x -7 = (5070)/13 -168/13 =4902/13`
`-> x = 4902/13 +7`
`-> x = 4902/13 + 91/13`
`-> x = (4993)/13`
Vậy `x = 4993/13`
`390 - ( x - 7 ) = 168 : 13`
`390 - ( x - 7 ) = 168/13`
`x - 7 = 390 - 168/13`
`x- 7 = 5070/13 - 168/13`
`x - 7 = 4902/13`
`x = 4902/13 + 7`
`x = 4902/13 + 91/13`
`x = 4993/13`
`Vậy :` `x = 4993/13`
`leminchau2909`