The ornamental design for a notebookcomputer, as shown and described.
FIG. 1 is a front view of a notebook computer showing our new design;
FIG. 2 is a rear view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is a perspective view of the notebook computer in an opened position;
FIG. 8 is a perspective view of the notebook computer in another opened position where the display of the notebook computer overlaps the keyboard of the notebook computer and faces outward;
FIG. 9 is an enlarged view of the circled portion so indicated in FIG. 3 thereof; and,
FIG. 10 is an enlarged view of the circled portion so indicated in FIG. 4 thereof.
The dashed broken lines illustrate portions of the notebook computer and form no part of the claimed design. The dot-dashed broken lines define the bounds of the claimed design and form no part thereof.