The ornamental design for a notebookcomputer, as shown and described.
FIG. 1 is a perspective view of a notebook computer, showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top-front perspective view of a notebook computer of FIG. 1, in which a display part of the notebook computer rotates on a hinge.
The broken lines are for environmental purposes only and form no part of the claimed design. The shade lines in the figures show contour and not surface ornamentation.