Question

[doraemon kaoru]

CHO \(\frac{x1}{x2}=\frac{x3}{x4};x1+x4\)khác 0

chứng minh rằng \(\frac{2017\cdot\left(x1\right)^2+\left(x3\right)^2}{2017\cdot\left(x2\right)^2+\left(x4\right)^2}=\frac{\left(x1+x3\right)^2}{\left(x2+x4\right)^2}\)

Answer 1

[Phạm Trọng An Nam]

x2 + x4 ma