Cho \(\dfrac{\overline{ab}+\overline{bc}}{a+c}=\dfrac{\overline{bc}+\overline{ca}}{b+c}=\dfrac{\overline{ca}+\overline{ab}}{c+a}\)
CMR : a = b = c
Cho \(\dfrac{a+\overline{bc}}{\overline{abc}}=\dfrac{b+\overline{ca}}{\overline{bca}}=\dfrac{c+\overline{ab}}{\overline{cab}}\). Chứng minh rằng \(\dfrac{\overline{ab}}{c}=\dfrac{\overline{ca}}{b}=\dfrac{\overline{bc}}{a}\)
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 \(\dfrac{\overline{abc}}{\overline{bc}}=\dfrac{\overline{bca}}{\overline{ca}}=\dfrac{\overline{cab}}{\overline{ab}}\). Tính \(\dfrac{a}{\overline{bc}}+\dfrac{b}{\overline{ca}}+\dfrac{c}{\overline{ab}}\)
Cho biết \(\dfrac{\overline{abc}}{\overline{bc}}=\dfrac{\overline{bca}}{\overline{ca}}=\dfrac{\overline{cab}}{\overline{ab}}\)
Tính tổng\(\dfrac{a}{\overline{bc}}+\dfrac{b}{\overline{ca}}+\dfrac{c}{\overline{ab}}\)
B1: Cho \(\frac{\overline{abc}}{a+\overline{bc}}=\frac{\overline{bca}}{b+\overline{ca}}\)
C/m: \(\frac{a}{\overline{bc}}=\frac{b}{\overline{ca}}\)
B2: Cho \(\frac{\overline{ab}+\overline{bc}}{a+b}=\frac{\overline{bc}+\overline{ca}}{b+c}=\frac{\overline{ca}+\overline{ab}}{c+a}\). C/m a = b = c
B3: Cho \(\left(a+b+c+d\right)\left(a-b-c-d\right)=\left(a-b+c-d\right)\left(a+b-c-d\right)\). C/m 4 số a; b; c; d lập thành 1 tỉ lệ thức
Cho \(c\ne0\) và \(\frac{\overline{ab}}{a+b}=\frac{\overline{bc}}{b+c}\). Chứng minh rằng : \(\frac{a}{b}=\frac{b}{c}\).( \(\overline{ab}\) và \(\overline{bc}\) số có 2 chữ số )
1.\(\dfrac{\overline{ab}}{\overline{bc}}\)=\(\dfrac{b}{c}\)(c≠0).CM:\(\dfrac{a^2+b^2}{b^2+c^2}\)=\(\dfrac{a}{c}\)
2.\(\dfrac{\overline{ab}}{a+b}=\dfrac{\overline{bc}}{b+c}.CM:\dfrac{a}{b}=\dfrac{b}{c}\)(c≠a)
Tìm các số tự nhiên \(\overline{ab}\) sao cho \(\overline{ab,}\) \(\overline{ba,}\) \(\overline{\left(a+1\right)b,}\) \(\overline{\left(b+1\right)a}\) là các số nguyên tố có hai chữ số.