abc
÷
×
+
a^b
a^2
sqrt
|a|
(
)
x
a
b
c
d
7
8
9
4
5
6
1
2
3
0
.
+
÷
×
(
)
abc
q
w
e
r
t
y
u
i
o
p
a
s
d
f
g
h
j
k
l
z
x
c
v
b
n
m
.
7
8
9
4
5
6
1
2
3
0
-
.