Question

матика..............................

Answer 1

$\int\limits^2_0 {} \, dy \int\limits^3_0 {xy} \, dx = \int\limits^2_0 {y(\frac{x^{2}}{2}} \, ) |_{0} ^{3} dy = \int\limits^2_0 {y(\frac{9}{2}-0)} \, dy = \frac{9}{2} \frac{y^{2}}{2} |_{0} ^{2} = \frac{9}{2} (\frac{4}{2} -0) = 9$