Cho a/b = c/d (a, b, c, d > 0)
CMR a/ 2a - 3b/ 2a + 3b = 2c - 3d/ 2c + 3d
b/ ab/cd = (a - b) 2/(c - d)2
Cho tỉ lệ thức a/b = c/d. CMR:
a) a+b/a-b = c+d/c-d
b) 2a+3b/2a-3b= 2c+3d/2c-3d
c) ab/cd= a2+b2/c2+d2
d) a/b= a+c/b+d
Cho a/b=c/d CMR 2a-3b/2a+3b=2c-3d/2c+3d
Cho \(\frac{a}{b}=\frac{c}{d}\). CMR
a) \(\frac{2a+3b}{2a-3b}=\frac{2c+3d}{2c-3d}\)
b) \(\frac{ab}{cd}=\frac{a^2+b^2}{c^2+d^2}\)
cho a/b=c/d CMR
a, 2a + 3b / 2a- 3b = 2c + 3d / 2c - 3d
b, ab/cd = a2 - b2 / c2 - d2
c, ( a + b / c + d )2 = a2 + b2 / c2 + d2
B1:
Cho a/b = c/d CMR:
a) 2a + 3b/ 2a - 3b = 2c + 3d/ 2c - 3d
b)a.b/c.d = a^2 - b^2/ c^2 - d^2
c)(a +b / c+d)^2 = a^2 +b^2/c^2 + d^2
Cho tỉ lệ thức a/b=c/d.Chứng minh
a)3a+5b/3a-5b=3c+5d/3c-5d
b) 2a + 3b/ 2a - 3b= 2c+3d/2c-3d
c)ab/cd=a^2-b^2/c^2-d^2
. Cho a/b = c/d với a, b, c, d > 0. Chứng minh rằng \(\dfrac{2a-3b}{2a+3b}=\dfrac{2c-3d}{2c+3d}\)
cho a/b=c/d .C/M 2a+3b/2a-3b=2c+3d/2c-3d