Đáp án :
`a) 4/5 . x = 9/4 - 0,25`
`4/5 . x = 2`
`x = 2 : 4/5`
`x = 5/2`
Vậy `x = 5/2`
`b) x . 3/5 = -1/3 : -1/2`
`x . 3/5 = 2/3`
`x = 2/3 : 3/5`
`x = 10/9`
Vậy `x = 10/9`
`c) 9/8 + 3/8x = 0,125`
`3/8x = 0,125 - 9/8`
`3/8x = -1`
`x = -1 : 3/8`
`x = -8/3`
Vậy `x = -8/3`
`d) -2/5x + 4/3 = 7/3`
`-2/5x = 7/3 - 4/3`
`-2/5x = 1`
`x = 1 : -2/5`
`x = -5/2`
Vậy `x = -5/2`
`e) 1/4 + 3/4 : x = -1/6 . 24`
`1/4 + 3/4 : x = -4`
`3/4 : x = -4 - 1/4`
`3/4 : x = -17/4`
`x = 3/4 : -17/4`
`x = -3/17`
Vậy `x = -3/17`
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