Question

[Ruby Châu]

Biết Chứng minh rằng

Answer 1

[Huỳnh Ngọc Lộc]

Theo đề bài ta được:

\(\dfrac{a}{b}=\dfrac{c}{d}\Rightarrow\dfrac{a}{b}=\dfrac{c}{d}=k\Rightarrow a=bk;c=dk\)

Ta có:

\(\dfrac{a^2+ac}{c^2-ac}=\dfrac{a\left(a+c\right)}{c\left(c-a\right)}=\dfrac{bk\left(bk+dk\right)}{dk\left(dk-bk\right)}=\dfrac{bk\left[k\left(b+d\right)\right]}{dk\left[k\left(d-b\right)\right]}=\dfrac{b\left(b+d\right)}{d\left(d-b\right)}\left(1\right)\)

\(\dfrac{b^2+bd}{d^2-bd}=\dfrac{b\left(b+d\right)}{d\left(d-b\right)}\left(2\right)\)

Từ (1) và (2) suy ra:\(\dfrac{a^2+ac}{c^2-ac}=\dfrac{b^2+bd}{d^2-bd}\)

Answer 2

[Ruby Châu]

Thanks!