Question

[Pham Trong Bach]

Tìm x, biết:

a ) x − 3 4 = 1 7   ;     b ) − x + 3 5 + 13 20 = 5 6

c ) x 2 − 2 5 = 1 10 ; d ) 15 x − 1 3 = 28 51

Answer 1

[Cao Minh Tâm]

a ) x = 25 28 b ) x = 5 12 .

c) x= 1             d) x = 17

Answer 2

[Nguyễn Thị Thương Hoài]

a; \(x\) - \(\dfrac{3}{4}\) = \(\dfrac{1}{7}\)

    \(x\)        = \(\dfrac{1}{7}\) + \(\dfrac{3}{4}\)

    \(x\)       =  \(\dfrac{4}{28}\) + \(\dfrac{21}{28}\)

    \(x\)       =  \(\dfrac{25}{28}\)

Vậy \(x=\dfrac{25}{28}\)