\(\dfrac{2x-1}{12}=\dfrac{5}{3}\)
\(\Rightarrow\left(2x-1\right)3=12\cdot5\)
\(\Rightarrow6x-3=60\)
\(\Rightarrow6x=63\)
\(\Rightarrow x=\dfrac{21}{2}\)
\(\dfrac{2x-3}{15}=\dfrac{3}{5}\)
\(\Rightarrow\left(2x-3\right)5=15\cdot3\)
\(\Rightarrow10x-15=45\)
\(\Rightarrow10x=60\)
\(\Rightarrow x=6\)
#Đạt Đang Bận Thở
\(\dfrac{2x-1}{12}=\dfrac{20}{12}\)
\(\Leftrightarrow2x-1=20\)
\(\Leftrightarrow2x=21\)
\(\Leftrightarrow x=\dfrac{21}{2}\)
b. \(\dfrac{2x-3}{15}=\dfrac{9}{15}\)
\(\Leftrightarrow2x-3=9\)
\(\Leftrightarrow x=6\)
\(\dfrac{2x-1}{12}\) = \(\dfrac{5}{3}\)
2\(x\) - 1 = \(\dfrac{5}{3}\) \(\times\) 12
2\(x\) - 1 = 20
2\(x\) = 20+ 1
2\(x\) = 21
\(x\) = 21: 2
\(x\) = \(\dfrac{21}{2}\)
b, \(\dfrac{2x-3}{15}\) = \(\dfrac{3}{5}\)
2\(x\) - 3 = \(\dfrac{3}{5}\) \(\times\) 15
2\(x\) - 3 = 9
2\(x\) = 9 + 3
2\(x\) = 12
\(x\) = 12: 2
\(x\) = 6
