คู่มือผู้ใช้

6
k 



2
Q*
5
%
10.

1
Q*
5
%
+
 5.
 105.

5
Q*
20
%
,
 100.
 400.
 


30
/
60
%
50% 50.
 



12
,
10
%
20% 20.
 



  

120
+
25
%
,
 160.
 40.
k 

 
c
 
d

f

e
 
80 × 9 = 720
e
80
*
9
c
MEMORY
720.
(−) 50 × 6 = 300 50
*
6
d
MEMORY
300.
(+) 20 × 3 = 60 20
*
3
c
MEMORY
60.
 480
f
MEMORY
480.
•  
A