Ta có: \(\frac{a}{b}=\frac{c}{d}=\frac{2c}{2d}=\frac{a+c}{b+d}=\frac{a+2c}{a+2d}\Leftrightarrow\left(a+2c\right)\left(b+d\right)=\left(a+c\right)\left(b+2d\right)\)
Cho ti le thuc a/b=c/d cmr (a+2c)(b+d)=(a+c)(b+2d)
cho ti le thuc \(\frac{a}{b}=\frac{c}{d}\)chung minh:
\(\frac{5a+2c}{5b+2d}=\frac{a-4c}{b-4d}\)
cho ti le thuc a/b=c/d chung minh rang (a+2c)(b+d)=(a+c)(b+2d)
cho ti le thuc a/b=c/d.Chung minh rang :(a+2c)(b=d)=(a+c)(b+2d)
cho day ti so bang nhau
\(\frac{2a+b+c+d}{a}=\frac{a+2b+c+d}{b}=\frac{a+b+2c+d}{c}=\frac{a+b+c+2d}{d}\)
tinh gia tri bieu thuc m=\(\frac{a+b}{c+d}=\frac{b+c}{d+a}=\frac{c+d}{a+b}=\frac{d+a}{b+c}\)
tìm x y z biết 2x+xy-y=5
cho ti le thuc a/b=c/d chung minh (a+2c)*(b+d)=(a+c)*(b+2d)
cho ti le thuc a/b=c/d
chung minh rang a+2c/b+2d=a-3c/b-3d
CMR tu ti le thuc \(\frac{a+b}{a-b}\)=\(\frac{c+d}{c-d}\)khac 1 ta co ti le thuc \(\frac{a}{b}\)=\(\frac{c}{d}\)
CMR tu ti le thuc \(\frac{a+b}{a-b}\)=\(\frac{c+d}{c-d}\)khac 1 ta co ti le thuc \(\frac{a}{b}\)=\(\frac{c}{d}\)
