Các câu hỏi tương tự
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 chung minh
1, ( 2a + 3c ) . ( 2b - 3d ) = ( 2a - 3c ) . ( 2b + 3d )
2, ( 4a + 3b ) . ( 4c - 3d ) = ( 4a - 3c ) . ( 4c + 3d )
cho a/b=c/d, chứng minh : (2a+3b)(4c-5d)= (4a-5b)(2c+3d)
cho a/b = c/d chứng minh 2a-3b/4a+5b =2c-3d/4c+5d
Tìm a, b, c, d, e,x, y biết :2a=3b; 2c=3d; 5d=2e; 2e=5x; 2x=3y; 2y=3a
chứng minh: a/b=c/d
a)a/(a+c)=b/(b+d)
b) (4a-3b)/(4c-3d) = (4a+3b)/(4c+3d)
cho a/b=c/d CMR
a, a-b/a+b = c-d/c+d
b, 2a+3b/2c+3d = 4a-5b/4c-5d
AI GIÚP MIK VS Ạ
Cho \(\frac{a}{b}=\frac{c}{d}\).Chứng minh:
a)\(\frac{a+c}{a}=\frac{b+d}{b}\)
b)\(\frac{4a+3b}{4c+3d}=\frac{4a-3b}{4c-3d}\)
cho biet a/b=c/d
Chứng minh:
Phần I: 4a-3b/4c-3d=4a+3b/4c+3d
Phần II: (a+c)2 / (b+c)2 = (a-c)2/(b-d)2