23x + 2 = 4x + 5

=> 23x - 4x = 5 - 2

=> 19x = 3

=> x = 3/19

8+8=16

2 nhé ban

\(9\div3\div\frac{1}{3}\)
\(=9\div\frac{3}{1}\div\frac{1}{3}\)
\(=9\times\frac{1}{3}\times\frac{3}{1}\)
\(=9\times\frac{1}{3}\times3\)
\(=\frac{9}{3}\times3\)
\(=3\times3\)
\(=9\)

a) \(y-6:2-\left(48-24.2:6-3\right)=0.\)

\(\Rightarrow y-3-\left(48-8-3\right)=0\)

\(\Rightarrow y-3-37=0\)

\(\Rightarrow y=0+37+3=40\)

Vậy y = 40

b) \(\left(7.13+8.13\right):\left(9\frac{2}{3}-y\right)=39\)

\(\Rightarrow195:\left(\frac{29}{3}-y\right)=39\)

\(\Rightarrow\frac{29}{3}-y=195:39=5\)

\(\Rightarrow y=\frac{29}{3}-5=\frac{14}{3}\)

Vậy y=\(\frac{14}{3}\)

\(\left(1-2x\right)^2=9\)

\(\left(1-2x\right)^2=3^2\)

\(\Rightarrow\left|1-2x\right|=3\)

\(1-2x=3\)Hoặc   \(1-2x=-3\)

\(2x=-2\)Hoặc    \(2x=4\)

\(x=-1\)Hoặc \(x=2\)