\(\sqrt{2x+1}=3\)

40:{[11+(26-3^3)]*2}

5 ,3*4, 7+(-1, 7)*5, 3-5 ,9

3*(5x 2/3)^2=4/3

\(\dfrac{1-\dfrac{8}{7}+\dfrac{8}{11}+\dfrac{8}{15}}{0,875-1+\dfrac{7}{11}+\dfrac{7}{15}}\)

9(x-1)^2-4/9:2/9=1/4

2^3*2^x-2,1=13,9

\(\dfrac{\left(-1\right)^{2018}\cdot\left(\dfrac{2}{5}\right)^3\cdot\left(\dfrac{15}{4}\right)^2}{\dfrac{15^2}{2^{\text{4}}}\cdot\left(\dfrac{2}{5}\right)^3}\)