| 摘要 |
<p>PURPOSE:To sum up simultaneously the total price and total number of books through simple operation and to omit such work as memorizing the price and the number of books at every type by providing a memory mechanism storing and adding a numeric. CONSTITUTION:For instance, the above-mentioned calculation equation, '250M + (memory plus) 480 X 10M + 700 X 3M + 1050M +' is calculated through a key operation in a memory 1 as shown in figure, and an answer of 8200 is outputted. On the other hand, an M + key of '250M +' is pressed in a memory 2 together with said key operation, and '1' is inputted. Then a numeric available from subtracting one from ten inputted next to a multiplying instruction key (X key) at the part '480 X 10' of '480 X 10M +', that is, nine, is stored and added, and '1' is stored and added the M + next to the ten. In the same manner three and '1' are automatically stored and added at '700 X3M +' and 'M +' of '1050M +', respectively, and an answer 15 is obtained.</p> |
