Question

Tìm x biết

1) 5| x-3| = 5/ 7

2) -3| 2x-5| = -3/4

3) 1/ 4| 3x-7| = 1/5

Answer 1

1) \(5\left|x-3\right|=\frac{5}{7}\)

\(\left|x-3\right|=\frac{5}{7}:5\)

\(\left|x-3\right|=\frac{5}{7}.\frac{1}{5}=\frac{1}{7}\)

+) \(x-3=\frac{1}{7}\)

     \(x=\frac{1}{7}+3=\frac{22}{7}\)

+) \(x-3=-\frac{1}{7}\)

\(x=-\frac{1}{7}+3=\frac{20}{7}\)

2 ) 3) tương tự

Answer 2

Answer 3

1) 5|x - 3| = 5/7

=> |x - 3| = 5/7 : 5 = 1/7

=> x - 3 = 1/7 hoặc x - 3 = -1/7

=> x = 22/7 hoặc x = 20/7

2) 3) tương tự như 1)