-Kmath科数- 中考、高考、考验数学题库

设 $D=\left\{\left( x,y\right)|-1≤x≤1,0≤y≤1\right\}$, 则 $\iint _{D}\left[x^{2}y+y \ln (x+ \sqrt {x^{2}+1})\right]dxdy=\underline { \quad \quad \quad }$.