1. Cho: \(\frac{a}{b}\)= \(\frac{c}{d}\). C/m : a) \(\frac{10a-b}{3a+7b}\)= \(\frac{10c-d}{3c+7d}\)b) \(\frac{7a^2+3ab}{11a^2-8b^2}\)= \(\frac{7c^2+3cd}{11c^2-8d^2}\)2. Cho : \(\frac{a}{b}\)=\(\frac{b}{c}\)=\(\frac{c}{d}\). C/m...
Đọc tiếp
1. Cho: \(\frac{a}{b}\)= \(\frac{c}{d}\). C/m : a) \(\frac{10a-b}{3a+7b}\)= \(\frac{10c-d}{3c+7d}\)
b) \(\frac{7a^2+3ab}{11a^2-8b^2}\)= \(\frac{7c^2+3cd}{11c^2-8d^2}\)
2. Cho : \(\frac{a}{b}\)=\(\frac{b}{c}\)=\(\frac{c}{d}\). C/m : \(\left(\frac{a+b+c}{b+c+d}\right)^3\)= \(\frac{a}{d}\)
