tỉ lệ thức \(\frac{a}{b}=\frac{c}{d}\)hãy suy ra a. \(\frac{a+b}{b}=\frac{c-d}{d}\)b.\(\frac{a-b}{b}=\frac{c-d}{d}\);c.\(\frac{a+b}{a}=\frac{c+d}{c}\);d.\(\frac{a-b}{a}=\frac{c-d}{c}\)
e.\(\frac{a}{a+b}=\frac{c}{c+d}\);f.\(\frac{a}{a-b}=\frac{c}{c-d}\)