cho a/b=c/d chứng minh 2a-3b/a+2b=2c-3d/c+2d
Cho a/b=c/d.Chứng minh;
a)a-b/2a=c-d/2c
b)5a-3b/3a+2b=5c-3d/3c+2d
cho a/b=c/d. CMR:
a,5a-3b/3a+2b=5c-3d/3c+2d
b,2a+7b/a-2b=2c+d/c-2d
c,ac/bd=(ac)mũ 2/(bd)mũ 2
d,2a mũ 2+3c mũ 2/3b mũ 2+3d mũ 2=5a mũ 2-2c mũ 2/2b mũ 2- 2d mũ 2
a, \(\frac{2a+3b}{2a-3b}=\frac{2c+3d}{2c-3d}\)
b, \(\frac{a^2.b^2}{c^2.d^2}=\frac{a^4+b^4-2a^2b^2}{c^4+d^4-2c^2d^2}\)
. 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. 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 tỉ lệ thức \(\frac{2a+3b}{2c+3d}=\frac{2a-3b}{2c-3d}\)CMR:\(\frac{2a^2+2b^2}{2c^2+2d^2}=\frac{2a^2-2b^2}{2c^2-2d^2}\)với c,d\(\ne\)0, 2c2-3d2\(\ne\)0
2.Chứng minh nếu a/b=c/d thi
a)\(\frac{a+b}{b}\)=\(\frac{c+d}{d}\)
b)\(\frac{2a+3b}{2c+3d}\)=\(\frac{5a-2b}{5c-2d}\)