HP 12C, Руководство пользователя

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Appendix B: Algebraic Mode (ALG) 243
File name: HP 12cpt_user's guide_English_110608.DOC Page: 284 of 285
Printed Date: { 2009/1/13 Dimension: 14.8 cm x 21 cm
Keystrokes
(ALG mode)
Display
90.89
} –13.54 }
completes the calculation.
65
gr§
12
} 96.75
New calculation:
12 65
×
z
3.5
} 27.64
Calculates 96.75 ÷ 3.5
You can also do long calculations without pressing
}
after each intermediate
calculation: just press it at the end. The operators perform from left to right, in the
order you enter them.
Keying in Negative Numbers ( )
The
Þ
key changes the sign of a number.
z
To key in a negative number, type that number and then press
Þ
.
z
To change the sign of an already displayed number, press
Þ
.
Keystrokes
(ALG mode)
Display
OO
0.00
Clears any pending operations.
75
Þ –75.
Changes the sign of 75
§
7.1
}
–532.50
Multiplies –75 by 7.1
Chain Calculations in ALG Mode
To do a chain calculation, you don’t need to press
}
after each operation, but
only at the very end.
For instance, to calculate
360
12 x 750
you can enter either:
z
750
§
12
} z
360
}
or
z
750
§
12
z
360
}
In the second case, the
z
key acts like the
}
key by displaying the result of 750
× 12.
Here’s a longer chain calculation:
9 . 1
68
5 . 18
75 456
×
−
This calculation can be written as: 456 – 75 ÷ 18.5 × 68 ÷ 1.9. Watch what
happens in the display as you key it in: