a/c=b/d=3a/3c=4b/4d=5a/5c=6b/6d=3a+4b/3c+4d=5a-6b/5c-6d
3a+4b/3c+4d=5a-6b/5c-6d =>
3a+4b/5a-6b=3c+4d/5c-6d
a/c=b/d=3a/3c=4b/4d=5a/5c=6b/6d=3a+4b/3c+4d=5a-6b/5c-6d
3a+4b/3c+4d=5a-6b/5c-6d =>
3a+4b/5a-6b=3c+4d/5c-6d
Cho tỉ lệ thức: 3a+4b/5a-6b=3c+4d/5c-6d. cmr: a/b=c/d
cho tỉ lệ thức: 3a+4b/5a-6b=3c+4d/5c-6d
Cmr: a/b=c/d
cho a.d=b.c chứng tỏ 3a+4b/5a+6b = 3c + 4d/ 5c+6d
a/b+c+d=b/a+c+d=c/b+a+d=d/c+b+a
P=2a+5b/3c+4d-2b+5c/3d+4a-2c+5d/3a+4b+2d+5a/3c+4b
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 a+b+c+d ≠ 0 thỏa mãn:
\(\dfrac{a}{b+c+d}=\dfrac{b}{a+c+d}=\dfrac{c}{b+a+d}=\dfrac{d}{c+b+a}\)
Tính P = \(\dfrac{2a+5b}{3c+4d}+\dfrac{2b+5c}{3d+4a}+\dfrac{2c+5d}{3a+4b}+\dfrac{2d+5a}{3c+4b}\)
Cho a+b+c+d ≠ 0 và \(\dfrac{a}{b+c+d}=\dfrac{b}{a+c+d}=\dfrac{c}{b+a+d}=\dfrac{d}{c+b+a}\)
Tính giá trị biểu thức:
P = \(\dfrac{2a+5b}{3c+4d}-\dfrac{2b+5c}{3d+4a}+\dfrac{2c+5d}{3a+4b}+\dfrac{2d+5a}{3c+4b}\)
cho \(\frac{3a+4b}{5a+6b}=\frac{3c+4d}{5c+6d}\), chứng minh: ad=bc.
Các bạn giúp mình nha:))
Cho a/b = c/d Chứng minh:
a. 3a+4b / 3a-4b = 3c+4d / 3c - 4d
b. 5a+2c / 4a = 5b+2d / 4b
c. (a+b)2 / (c+d)2 = a2+b2 / c2+d2
CẢM ƠN.