\(\frac{7x+5y}{3x-7y}=\frac{7z+5t}{3z-7t}\Rightarrow\left(7x+5y\right)\left(3z-7t\right)=\left(7z+5t\right)\left(3x-7y\right)\)
\(\Leftrightarrow21xz-49xt+15yz-35yt=21xz-49yz+15xt-35yt\)
\(\Leftrightarrow-49xt+15yz=-49yz+15xt\Leftrightarrow-64xt=-64yz\Leftrightarrow xt=yz\Leftrightarrow\frac{x}{y}=\frac{z}{t}\)
Vậy ta có đpcm
cho \(\frac{7x+5y}{3x-7y}=\frac{7z+5t}{3z-7t}\). CM ; \(\frac{x}{y}=\frac{z}{t}\)
Cho\(\frac{7x+5y}{3x-7y}=\frac{7z+5t}{3z-7t}CMR:\frac{x}{y}=\frac{z}{t}\)
cho\(\dfrac{7x+5y}{3x-7y}=\dfrac{7z+5t}{3z-5t}\).CMR \(\dfrac{x}{y}=\dfrac{z}{t}\)
Cho: \(\frac{7x+5y}{3x-7y}=\frac{7z+5t}{3z-7t}\).Chứng mình rằng \(\frac{x}{y}=\frac{z}{t}\)
Cho \(\frac{7x+5x}{3x-7y}=\frac{7z+5t}{3z-7t}\). Chứng minh : \(\frac{x}{y}=\frac{z}{t}\)
1) Cho \(\frac{7x+5y}{3x-7y}\)=\(\frac{7z+5t}{3z-7t}\) Chứng minh \(\frac{x}{y}\)=\(\frac{z}{t}\)
2) Tìm x
51x+26y=2000
|x+1.1|+|x+1.2|+|x+1.3|+|x+1.4|=5x
3)Tính
\(\left(\frac{3}{4}-81\right)\)\(\left(\frac{3^2}{5}-81\right)\)\(\left(\frac{3^3}{6}-81\right)\)......\(\left(\frac{3^{2000}}{2003}-81\right)\)
cho (2x+13y)/(3x-7y)=(2z+13t/3z-7t). chứng minh x/y=z/t
Cho \(\frac{7x+5y}{3x-7y}\) =\(\frac{7z+5t}{3z-7t}\) Chứng minh \(\frac{x}{y}\)= \(\frac{z}{t}\) Các cậu giúp mình với ạ~~ <<_>>
tìm x,y,z biết 3x-5y/2=7y-3z/3=5z-7x/4; x+y+z=17
