Ta có: \(\frac{a}{b}=\frac{c}{d}\)\(\Rightarrow a=bk,c=dk\)
\(\frac{3a+7b}{3c-7d}=\frac{3bk+7b}{3dk+7d}=\frac{b\left(3k+7\right)}{d\left(3k+7\right)}=\frac{b}{d}\)(1)
\(\frac{3a-7b}{3c-7d}=\frac{3bk-7b}{3dk-7d}=\frac{b\left(3k-7\right)}{d\left(3k-7\right)}=\frac{b}{d}\)(2)
Từ (1) và (2) \(\Rightarrow\frac{3a+7b}{3c+7d}=\frac{3a-7b}{3c-7d}\)
\(cho:\frac{2a+13b}{3a-7b}=\frac{2c+13d}{3c-7d}.CMR:\frac{a+b}{b}=\frac{c+d}{d}\)
cho tỉ lệ thức\(\frac{2a+13d}{3a-7b}=\frac{2c+13d}{3c-7d}\)
CMR\(\frac{a}{b}=\frac{c}{d}\)
Cho \(\frac{a}{b}=\frac{c}{d}\)Chứng minh \(\frac{3a+7b}{3a-5b}=\frac{3c+7d}{3c-5d}\)
Cho tỉ lệ thức \(\frac{2a+13b}{3a-7b}=\frac{2c+13d}{3c-7d}\) CMR : \(\frac{a}{b}=\frac{c}{d}\)
Cho \(\frac{a}{b}\)=\(\frac{c}{d}\),CMR:
a,\(\frac{2a+13b}{3a-7b}\)=\(\frac{2c+13d}{3c-7d}\)
Cho tỉ lệ thức:
\(\frac{2a+13b}{3a-7b}=\frac{2c+13d}{3c-7d}\)
Chứng minh rằng: \(\frac{a+b}{b}=\frac{c+d}{d}\)
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 \(\frac{2a+13b}{3a-7b}=\frac{2c+13d}{3c-7d}\) . Chứng minh: \(\frac{a}{b}=\frac{c}{d}\)
Cho tỉ lệ thức :\(\frac{2a+13b}{3a-7b}=\frac{2c-13d}{3c-7d}\)
Chứng minh rằng:\(\frac{a}{b}=\frac{c}{d}\)
