HP 40gs User Manual page 258

15-6
this case, you have to press
expression.
The following illustration shows how an expression can
be viewed as a tree in the Equation Writer. It illustrates a
tree view of the expression:
( ) ⋅ (
5x + 3 x 1 –
---------------------------------------- -
x + 3
+
×
Suppose that the cursor is positioned to the right of 3:
•
If you press
•
If you press
tree, with x + 3 now selected.
•
If you press
tree, and now the entire expression is selected.
•
If you had pressed
cursor was positioned to the right of 3, the leaves of
the branch get selected (that is, x + 3).
•
If you press
tree, and now the entire expression is selected.
•
If you now press
•
If you now press
selected (that is, (5x + 3).
•
Continue pressing
turn (5x and then 5).
to select elements in the
)
÷
×
–
!
once, the 3 component is selected.
again, the selection moves up the
again, the selection moves up the
instead of
again, the selection moves up the
, just the numerator is selected.
again, the top-most branch
to select each top-most leaf in
+
!
when the
Equation Writer