Cho a/b=c/d. Chứng minh a/3a+b=c/3c+d (3 cách)
cho a/b= c/d
Chứng minh rằng; a/3a+b= c/3c+d
a,cho 3a-b/3a+b=3c-d/3c+d cmr a/b=c/d
b,cho a/b=c/d cmr:b^2+d^2/a^2+c^2=bd/ac
Cho a/b=c/d. Chứng minh a/3a-4b = c/ 3c-4d
Cho a/b=c/d CMR
a, 3a/b=3c/d
b, a+b/b=c+b/a
c, 3a+b/b= 3c+d/d
Cho a / 3b = b / 3c = c / 3d = d / 3a và a + b + c + d khác 0
Chứng minh rằng a = b = c =d
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 chứng minh rằng
a, a/a-b = c/c-d
b,a/b = a+c/ b+d
c, a/3a+b = c/ 3c+d
a/b=c/d ,chứng minh a/3a+b=c/3c+d