tìm x
a) 4x – 33 = -5 b) 2.x + 1/4 = 3/2 d) |x + 2/7| = 1/6
tìm x a) 4x – 33 = -5 b) 2.x + 1/4 = 3/2 d) |x + 2/7| = 1/6
By Faith
By Faith
tìm x
a) 4x – 33 = -5 b) 2.x + 1/4 = 3/2 d) |x + 2/7| = 1/6
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Đáp án:
$a,$ `4x – 33 = -5`
`-> 4x = -5 + 33`
`-> 4x = 28`
`-> x = 28 : 4`
`-> x = 7`
Vậy `x = 7`
$b,$ `2x + 1/4 = 3/2`
`-> 2x = 3/2 – 1/4`
`-> 2x = 5/4`
`-> x = 5/4 : 2`
`-> x = 5/8`
Vậy `x = 5/8`
$d,$ `|x + 2/7| = 1/6`
`-> x + 2/7 = 1/6` hoặc `x + 2/7 = -1/6`
`-> x = 1/6 – 2/7` hoặc `x = -1/6 – 2/7`
`-> x = -5/42` hoặc `x = -19/42`
Vậy `x = -5/42` hoặc `x = -19/42`