HP 49g+, Руководство пользователя, Страница: 64 / 862

Page 2-9
The editing cursor is shown as a blinking left arrow over the first character in
the line to be edited. As in an earlier exercise on line editing, we will use the
right and left arrow keys,
š™
, to move the cursor to the appropriate
place for editing, and the delete key,
ƒ
, to eliminate characters.
The following keystrokes will complete the editing for this case:
•
Press the right arrow key,
™
, until the cursor is to the right of the x
•
Type
Q2
to enter the power 2 for the x
•
Press the right arrow key,
™
, until the cursor is to the right of the y
•
Press the delete key,
ƒ
, once to erase the characters y.
•
Type
~„x
to enter an x
•
Press the right arrow key,
™
, 4 times to move the cursor to the right
of the *
•
Type
R
to enter a square root symbol
•
Type
„Ü
to enter a set of parentheses (they come in pairs)
•
Press the right arrow key,
™
, once, and the delete key,
ƒ
, once,
to delete the right parenthesis of the set inserted above
•
Press the right arrow key,
™
, 4 times to move the cursor to the right
of the b
•
Type
„Ü
to enter a second set of parentheses
•
Press the delete key,
ƒ
, once, to delete the left parenthesis of the
set inserted above.
•
Press
`
to return to normal calculator display.
The result is shown next:
Notice that the expression has been expanded to include terms such as
|R|, the absolute value, and SQ(b
⋅
R), the square of b
⋅
R. To see if we can
simplify this result, use FACTOR(ANS(1)) in ALG mode: