Có \(\frac{x}{4}=\frac{21}{28}\)
\(\Rightarrow x=\frac{21}{28}.4\)
\(\Rightarrow x=3\)
Vậy x=3
b, \(\frac{2x}{5}=\frac{-24}{10}\)
\(\frac{\Rightarrow2x}{5}=-\frac{12}{5}\)
\(\Rightarrow2x=-\frac{12}{5}.5\)
\(\Rightarrow2x=-12\)
\(\Rightarrow x=-12:2\)
\(\Rightarrow x=-6\)
Vậy x=-6
a) \(\frac{x}{4}=\frac{21}{28}\)
\(\Rightarrow\frac{x}{4}=\frac{3}{4}\)
\(\Rightarrow x=3\)
b)\(\frac{2x}{5}=\frac{-24}{10}\)
\(\Rightarrow\frac{2x}{5}=\frac{-12}{5}\)
\(\Rightarrow2x=-12\)
\(\Rightarrow x=-6\)
\(a.\frac{x}{4}=\frac{21}{28}\)
\(\Rightarrow\frac{x}{4}=\frac{3}{4}\)
\(\Rightarrow x=3\)
Vậy x = 3
\(b.\frac{2x}{5}=-\frac{24}{10}\)
\(\Rightarrow\frac{2x}{5}=-\frac{12}{5}\)
\(\Rightarrow2x=-12\)
\(\Rightarrow x=-6\)
Vậy x = - 6
\(\frac{x}{4}\)= \(\frac{21}{28}\)
a / 28x = 21 . 4
28x = 84
x = 84: 28
x = 3
b/ \(\frac{2x}{5}\)= \(\frac{-24}{10}\)
2x .10 = 5 .(-24)
20x = -120
x = -120 : 20
x = -6
