. 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. Chứng minh 2a+3b/2a-3b=2c+3d/2c-3d
Cho a/b=c/d. Chứng minh rằng : 2a+3b/2a-3b = 2c+3d/2c-3d
Cho (2a+3b) / (2a - 3b) = (2c+3d) / (2c - 3d)
Chứng minh rằng: a/b = c/d
a/b = c/d chứng minh rằng 2a+3b / 2a-3b=2c+3d/2c-3d
Cho a/b=c/d, chứng minh rằng: 2a+3b/2c+3d=2c+3d/2c-3d
cho a/b=c/d .C/M 2a+3b/2a-3b=2c+3d/2c-3d
Cho a/b=c/d CMR 2a-3b/2a+3b=2c-3d/2c+3d
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