HaỮTH HHTerpaJI int _(1)^2dx Bbl6epuTe OAMH OTBeT: a. x/2 b. x C. 1 d. 2

To solve the integral $\int_{1}^{2} dx$, we need to understand that this is a definite integral over the interval from 1 to 2 with respect to the variable $x$. <br /><br />The integral of 1 with respect to $x$ is simply $x$. Therefore, the integral $\int_{1}^{2} dx$ evaluates to $x$ evaluated from 1 to 2.<br /><br />So, the correct answer is:<br />b. $x$