HP HP-67 - Page 40

36 Getting Started
To solve Press Display
3(16 —4) 16
4
2
3
8
14+7+3-2
14
4
BrDOoBeenw
Problems that are even more complicated can be solved in the same
simple manner, using the automatic storage of intermediate results.
For example, to solve (2 + 3) X (4 + 5) with a pencil and paper, you
would:
2+3) x4 +)5)
—_— —_—
First solve for the contents l /
of these parentheses... ...andthen for these parentheses...
...and then you would multiply the
two intermediate answers together.