\(\frac{a}{b}\)= \(\frac{c}{d}\)=> \(\frac{a}{c}\)= \(\frac{b}{d}\)= \(\frac{4a}{4c}\)= \(\frac{6b}{6d}\)= \(\frac{4a+6b}{4c+6d}\)
\(\frac{a}{c}\)= \(\frac{b}{d}\)= \(\frac{5a}{5c}\)= \(\frac{7b}{7d}\)= \(\frac{5a-7b}{5c-7d}\)
=> \(\frac{4a+6b}{4c+6d}\)= \(\frac{5a-7b}{5c-7d}\)
=> \(\frac{4a+6b}{5a-7b}\)= \(\frac{4c+6d}{5c-7d}\)
cho\(\frac{2a+15b}{5a-7b}=\frac{2c+15d}{5c-7d}\)
CMR : \(\frac{a}{b}=\frac{c}{d}\)
\(Cho\frac{a}{b}=\frac{c}{d}.CMR:\frac{5a^2+7ab}{4a^2-9b^2}=\frac{5c^2+7cd}{4c^2-9cd}\)
Cho tỉ lệ thức \(\frac{a}{b}=\frac{c}{d}.\)CMR: \(\frac{5a+7b}{11a-13b}=\frac{5c+7d}{11c-13d}\)
Cho tỉ lệ thức \(\frac{2a+15b}{5a-7b}=\frac{2c+15d}{5c-7d}\)
CMR \(\frac{a}{b}=\frac{c}{d}\)
Cho \(\frac{a}{b}=\frac{c}{d}\) CMR: \(\frac{4a-2b}{5a+2b}=\frac{4c-2d}{5c+2d}\)
a/ Cho ti le thuc \(\frac{a}{b}=\frac{c}{d}\)
Chung minh: \(\frac{2a+5b}{3a-7b}=\frac{2c+5d}{3c-7d}\)
b/ Cho ti le thuc: \(\frac{x}{y}=\frac{m}{n}\)
Chung minh; \(\frac{5x+4y}{3x-6y}=\frac{5m+4n}{3m-6n}\)
cho tỷ lệ thức a/b=c/d. chứng minh:
a, 2a+5b/3a-4b=2c+5d/3c-4d
b. 3a+7b/5a-7b=3c+7d/5c-7d
d. 4a+9b/4a-7b=4c+9d/4c-7d
giúp mình với ạ
cho ti le thuc \(\frac{a}{b}=\frac{c}{d}\)chung minh:
\(\frac{5a+2c}{5b+2d}=\frac{a-4c}{b-4d}\)
Cho \(\frac{5a-4b}{6}=\frac{6a-4c}{5}=\frac{6b-5c}{4}\)
CMR: \(\frac{c}{6}=\frac{b}{5}=\frac{a}{4}\)
