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 \(\dfrac{a}{b}\) = \(\dfrac{c}{d}\). Chứng minh \(\dfrac{2a+3c}{3a+4c}=\dfrac{2b+3d}{3b+4d}\)
Cho \(\frac{a}{b}=\frac{c}{d}\)Chứng tỏ rằng
a)\(\frac{a+4c}{a-4c}\)=\(\frac{b+4d}{b-4d}\)
b)\(\frac{5a+3b}{5a-3b}=\frac{5c+3d}{5c-3d}\)
Đề bài : Cho a/ b = c/ d. Chứng minh rằng:
a.3a + 3b / 3c + 3d = 4a - 4b / 4c - 4d
cho a/b=c/d chưng tỏ:
3a+4b/3c+4d=6a+7b/6c+7d
cho a/b=c/d chứng minh
a) a+b/c=c+b/d
b) 7a+4b/2a-3b= 7c+4d/2c-3d
Cho \(\dfrac{a}{b}=\dfrac{c}{d}\). Chứng minh:
1) \(\dfrac{2a+3c}{2b+3d}=\dfrac{2a-3c}{2b-3d}\)
2) \(\dfrac{4a-3b}{4c-3d}=\dfrac{4a+3b}{4c+3d}\)
3) \(\dfrac{3a+5b}{3a-5b}=\dfrac{3c+5d}{3c-5d}\)
4) \(\dfrac{3a-7b}{b}=\dfrac{3c-7d}{d}\)
Cho a/b =c/d chung minh:
(5a-3b/6a-7b)=(c-3d/6c+7b)
Cho tỷ lệ thức \(\frac{a}{b}=\frac{c}{d}\). Chứng minh rằng:
\(\frac{4a+9b}{7a-6b}=\frac{4c+9d}{7c-6d}\)