Question

CMR:\(\frac{a}{c}=\frac{b}{d}\)

\(\Rightarrow\)\(\frac{7a^2+3ab}{7c^2+3cd}=\frac{7a^2+3cd}{11c^2+8d^2}\)

Answer 1

Bn ơi có sai đề ko vậy

Answer 2

a/b = c/d         => a/c = b/d 

=> a 2 / c 2 = b 2 / d 2 = ab / cd

<=> 7a 2 / 7c 2 = 11a 2 / 11c 2 = 8b 2 / 8d 2 = 3ab / 3cd

=> 7a 2 + 3ab / 7c 2 + 3cd = 11a 2 - 8b 2 / 11c 2 - 8d 2 

=> 7a 2 + 3ab / 11a 2 - 8b 2 = 7c 2 + 3cd / 11c 2 - 8d 2                (đpcm)

k cho mk nha bn sai đề bài ak

Answer 3

U co giao minh bao sai de roi ( vua hom qua song)