Casio FX-82ES PLUS - Inputting Expressions and Values; Basic Input Rules and Syntax

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Specifications
Power supply:
Fx-82ES PLUS: battery AAA R03 (UM-4) x 1
Fx-350ES PLUS: battery AAA LR03 (AM4) x 1
Fx85ES PLUS: Built-in solar battery, button battery LR44 (GPA76) x 1
Approximate battery life:
Fx-82ES PLUS: 17 000 hours (when the blinking cursor is displayed continuously)
Fx-350ES PLUS: 8 700 hours (during continuous operation)
Fx85ES PLUS: 3 years (with 1-hour operation per day)
Power consumption:
0,0002 W (fx-82/350ES PLUS)
Operating temperature:
0 °C - 40 °C
Dimensions:
Fx-82/350ES PLUS: 13,8 (H) x 80 (W) x 162 (D) mm
Fx85ES PLUS: 11,1 (H) x 80 (W) x 162 (D) mm
Approximate weight:
Fx-82/350ES PLUS: 100 g incl. battery
Fx85ES PLUS: 95 g incl. battery