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Ta có: \(\frac{t}{x}\)= \(\frac{4}{3}\)=\(\frac{8}{12}\)         \(\frac{z}{x}\)=\(\frac{1}{6}\)=\(\frac{2}{12}\)

          \(\frac{y}{z}\)=\(\frac{3}{2}\)

Suy ra: \(\frac{t}{y}\)=\(\frac{8}{3}\)

cặn kẽ xíu nữa nha bạn mk ko hiểu 

Lời giải:
$\frac{y}{z}.\frac{z}{x}=\frac{3}{2}.1$

$\Rightarrow \frac{y}{x}=\frac{3}{2}$
Suy ra:
$\frac{t}{y}=\frac{t}{x}.\frac{x}{y}=\frac{4}{3}.\frac{2}{3}=\frac{8}{9}$

1, ta co \(\frac{x}{5}=\frac{y}{6}=\frac{x}{20}=\frac{y}{24}\)

\(\frac{y}{8}=\frac{z}{7}=\frac{y}{24}=\frac{z}{21}\)

=>\(\frac{x}{20}=\frac{y}{24}=\frac{z}{21}=\frac{x+y-z}{20+24-21}=\frac{69}{23}=3\)

=>\(x=3\cdot20=60\)

    \(y=3\cdot24=72\)

    \(z=3\cdot21=63\)

3. ta co \(\frac{x}{15}=\frac{y}{7}=\frac{z}{3}=\frac{t}{1}=\frac{x+y-z+t}{15-7+3-1}=\frac{10}{10}=1\)

=> \(x=1\cdot15=15\)

     \(y=1\cdot7=7\)

     \(z=1\cdot3=3\)

     \(t=1\cdot1=1\)

6z = x <=> z = x/6 
2y = 3z <=> 2y = 3x/6 <=> 12y = 3x <=> x = 12y/3 = 4y 
3t = 4x <=> 3t = 4 (4y) = 16y 

đáp số: 
tỷ số t/y = 16/3

Ta có: t/x:z/x=4/3:1/6

         t/x.x/z=4/3.6

         t/z=8

Lại có: t/z:y/z=8:3/2

           t/z.z/y=8.2/3

           t/y=16/3
 

C

\(\hept{\begin{cases}\frac{x}{y}=\frac{2}{3}\\\frac{t}{y}=\frac{4}{9}\end{cases}}\Rightarrow\frac{x}{y}:\frac{t}{y}=\frac{2}{3}:\frac{4}{9}\Leftrightarrow\frac{x}{y}.\frac{y}{t}=\frac{2}{3}.\frac{9}{4}\Leftrightarrow\frac{x}{t}=\frac{3}{2}\)

\(\hept{\begin{cases}\frac{x}{t}=\frac{3}{2}\\\frac{z}{t}=\frac{5}{8}\end{cases}}\Rightarrow\frac{x}{t}:\frac{z}{t}=\frac{3}{2}:\frac{5}{8}\Leftrightarrow\frac{x}{t}.\frac{t}{z}=\frac{3}{2}.\frac{8}{5}\Leftrightarrow\frac{x}{z}=\frac{12}{5}\)

x/z=12/5 nha bạn