Tìm giá trị của k biết rằng:

a) k=\(\frac{\overline{ab}}{\overline{abc}}=\frac{\overline{bc}}{\overline{bca}}=\frac{\overline{ca}}{\overline{cab}}\)

b) k= \(\frac{\overline{abc}}{\overline{ab}+c}=\frac{\overline{bca}}{\overline{bc}+a}=\frac{\overline{cab}}{\overline{ca}+b}\)

Bài 3: Tìm các chữ số a, b, c biết: 
a) \(\overline{12ab}=\overline{ab}.26\)
b) \(\overline{7ab}=20.\overline{ab}+35\)
c) \(\overline{2ab2}=36.\overline{ab}\)
d) \(\overline{abc3}-1992=\overline{abc}\)
e*) \(\overline{ab}+\overline{bc}+\overline{ca}=\overline{abc}\)
 

Cho biết \(\dfrac{\overline{abc}}{\overline{bc}}=\dfrac{\overline{bca}}{\overline{ca}}=\dfrac{\overline{cab}}{\overline{ab}}\)

Tính tổng\(\dfrac{a}{\overline{bc}}+\dfrac{b}{\overline{ca}}+\dfrac{c}{\overline{ab}}\)

Cho biết:\(\overline{\frac{abc}{\overline{bc}}=\frac{\overline{bca}}{\overline{ca}}=\frac{\overline{cab}}{\overline{ab}}}\)

Tính tổng:\(\frac{a}{\overline{bc}}+\frac{b}{\overline{ca}}+\frac{c}{\overline{ab}}\)

Cho tỉ lệ thức \(\dfrac{\overline{abc}}{a+\overline{bc}}=\dfrac{\overline{bca}}{b+\overline{ca}}\). CMR tỉ lệ thức \(\dfrac{a}{\overline{bc}}=\dfrac{b}{\overline{ca}}\)

cho \(\dfrac{\overline{abc}}{\overline{bc}}=\dfrac{\overline{bca}}{\overline{ca}}=\dfrac{\overline{cab}}{\overline{ab}}\). Tính \(\dfrac{a}{\overline{bc}}+\dfrac{b}{\overline{ca}}+\dfrac{c}{\overline{ab}}\)

Cho \(\dfrac{\overline{abc}}{a+\overline{bc}}=\dfrac{\overline{bca}}{b+\overline{ca}}\). Chứng minh: \(\dfrac{a}{\overline{bc}}=\dfrac{b}{\overline{ca}}\)

Cho:\(\dfrac{a+\overline{bc}}{\overline{abc}}=\dfrac{b+\overline{ca}}{\overline{bca}}=\dfrac{c+\overline{ab}}{\overline{cab}}\)

CMR:\(\overline{\dfrac{bc}{a}=\dfrac{\overline{ca}}{b}=\dfrac{\overline{ab}}{c}}\)

Cho \(\frac{a+\overline{bc}}{\overline{abc}}=\frac{b+\overline{ca}}{\overline{bca}}=\frac{c+\overline{ab}}{\overline{cab}}\)

Chứng minh \(\frac{\overline{bc}}{a}=\frac{\overline{ca}}{b}\frac{\overline{ab}}{c}\)