The specific steps to open the cube with the calculator that comes with the computer are as follows:

1. Enter "Calculator" in the search box in the lower left corner of the computer to search, and then click Use.

2. Click on the upper left corner of the calculator and select "Science" from the pop-up menu.

3. Find "↑" in the main interface of the calculator and click continuously until you find the position of the symbol shown in the figure below, which is a power symbol.

4. Take "27" as an example, click the number 27, then click the Y root of X, and then click 3, which is the third root. The final result is 3.