Đáp án:
a) x - 2/3 = 7/3
x = 7/3 + 2/3
x = 3
b) (3/15 - x) . 1/3 = 2/5
3/15 - x = 2/5 : 1/3
3/15 - x = 2/5 . 3
3/15 - x = 6/5
x = 3/15 - 6/5
x = 3/15 - 18/15
x = -1
c) |1/4 - 2x| - 3/4 = 0
| 1/4 - 2x| = 0 + 3/4
| 1/4 - 2x| = 3/4
1/4 - 2x = 3/4 hoặc 1/4 - 2x = -3/4
2x = 1/4 - 3/4 hoặc 2x = 1/4 - (-3/4)
2x = -1/2 hoặc 2x = 1
x = -1/2 : 2 hoặc x = 1 : 2
x = -1/4 hoặc x = 1/2
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