Đáp án:
Giải thích các bước giải:
` x - 2/5 = -1/3 : -25/6 `
` x - 2/5 = 2/25 `
` x = 2/25 + 2/5 `
` x = 12/25 `
vậy ` x = 12/25 `
` x-1 . (-3) = 2.9 `
` x - 1 . -3 = 18 `
` x - 1 = 18 : -3 `
` x - 1 = 6 `
` x = 6 + 1 `
` x = 7 `
vậy ` x = 7 `
`(4,5 -2x). 1 4/7 = -11/14 `
`(4,5-2x ) 11/7 = -11/14 `
` 4,5 - 2x = -11/14 : 11/7 `
` 9/2-2x = -1/2 `
` 2x = 9/2 - ( -1/2)`
`2x = 5 `
` x = 5 : 2 `
` x = 5/2 `
vậy ` x = 5/2 `
`5/12 - (-1/3x - 1 5/12 ) = (-2/3)^2 `
` 5/12 - (-1/3x - 17/12 ) = 4/9 `
` -1/3x - 17/12 = 5/12 - 4/9 `
`-1/3x - 17/12 = -1/36 `
` -1/3x = -1/36 + 17/12 `
`-1/3x = 25/18 `
` x = 25/18 : -1/3 `
`x = -25/6 `
vậy ` x = -25/6 `
`-1/4x + 75%x = -4 `
` -1/4x + 75/100x = -4 `
`-1/4x .x= -4 - 75/100 `
`-1/4x.x = -19/4 `
` 2x = -19/4 : -1/4 `
`2 x = 19:2`
`x = 8`
vậy ` x = 8 `
