这道题目怎么解，以及这一类题目的解法，通过视频讲解清楚---**Extracted Content:** **Question:** 3. 如图所示一个 5×5×5 的立方体，所有的面的中心十字被打通，此立体图形的体积是_____；表面积是_____. **English Translation of Question:** 3. As shown in the figure, a 5x5x5 cube, the central cross on all faces is cleared out, the volume of this solid figure is _____ ; the surface area is _____. **Image Description:** * **Type:** 3D geometric solid. * **Main Elements:** * A solid figure constructed from smaller cubes, appearing to be a modified 5x5x5 cube. * The solid has cubic structure arranged in a 5x5x5 grid. * Central channels are removed from the cube, passing through the interior and exiting all six faces. * The removed parts form three intersecting tunnels parallel to the axes of the original cube. * These tunnels correspond to the removal of the central layer of unit cubes (the 3rd layer) along each of the three dimensions. * The remaining solid is the parts of the original cube that are not in the central layer along any axis. * The removed areas are shown as empty spaces within the grid.