\(\frac{x}{4}=\frac{3}{2}\)
\(\Rightarrow\frac{x}{4}=\frac{6}{4}\)
\(\Rightarrow x=6\)
vậy_
b)\(\frac{2}{x}=\frac{x}{8}\)
\(\Rightarrow x^2=2\cdot8\)
\(x^2=16\Rightarrow x=4\)
c) \(\frac{x+3}{4}=\frac{5}{3}\)
\(3\left(x+3\right)=4\cdot5\)
\(3x+9=20\)
\(3x=11\)
\(x=\frac{11}{3}\)
Còn d , e, j nữa bạn nào giúp mình đi
a)\(\frac{x}{4}=\frac{3}{2}\)
\(\Leftrightarrow x=\frac{4.3}{2}=6\)
b)\(\frac{2}{x}=\frac{x}{8}\)
\(\Leftrightarrow x^2=16\)
\(\Leftrightarrow x=\sqrt{16}=4\)
c)\(\frac{x+3}{4}=\frac{5}{3}\)
\(\Leftrightarrow3x+9=20\)
\(\Leftrightarrow3x=11\)
\(\Leftrightarrow x=\frac{11}{3}\)
d)\(\frac{x+1}{4}=\frac{9}{x+1}\)
\(\Leftrightarrow\left(x+1\right)^2=36\)
\(\Leftrightarrow x+1=6\)
\(\Leftrightarrow x=5\)
e) \(\frac{3,8}{2x}=\frac{1}{4}:\frac{8}{3}\)
\(\Leftrightarrow\frac{3,8}{2x}=\frac{3}{32}\)
\(\Leftrightarrow6x=121,6\)
\(\Leftrightarrow x=\frac{304}{15}\)
j) \(\frac{0,25x}{3}=\frac{5}{6}:0,125\)
\(\Leftrightarrow\frac{0,25x}{3}=\frac{5}{48}\)
\(\Leftrightarrow12x=15\)
\(\Leftrightarrow x=\frac{5}{4}\)
( 0,25x ) : 3 = 5/6 : 0,125
( 0,25x ) :3=5/6 : 0,125
( 0,25x ) = 750 . 3
0,25x = 2250
x = 2250 : 0,25
x = 225000/25
