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N
u
m
b
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a
d
d
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s
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b
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S
i
n
g
l
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A
d
d
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f
a
c
t
f
a
m
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l
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(
a
+
b
=
c
,
c
-
b
=
a
)
F
a
c
t
F
a
m
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l
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I
n
v
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s
t
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a
t
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R
e
p
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s
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n
t
a
t
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f
a
d
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s
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b
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g
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b
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c
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S
t
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a
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g
y
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B
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g
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1
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s
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a
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w
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S
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C
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p
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s
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w
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S
t
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a
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g
y
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N
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b
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s
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a
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w
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U
s
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g
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d
d
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s
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b
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C
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A
d
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1
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A
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1
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'
s
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d
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1
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p
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2
0
A
d
d
m
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p
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2
0
A
d
d
3
n
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b
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(
m
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x
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f
s
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g
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w
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d
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b
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)
I
W
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d
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b
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I
A
d
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1
0
0
'
s
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d
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b
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A
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p
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f
1
0
0
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s
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d
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S
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c
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1
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s
f
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P
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b
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u
p
t
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5
0
A
d
d
m
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s
s
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g
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l
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m
e
n
t
s
t
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m
a
k
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a
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m
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t
t
r
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w
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t
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t
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s
u
p
t
o
5
0
I
n
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q
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w
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d
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b
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c
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s
t
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m
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s
Lesson
Practice
A
d
d
3
n
u
m
b
e
r
s
(
m
i
x
o
f
s
i
n
g
l
e
o
r
t
w
o
d
i
g
i
t
n
u
m
b
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r
s
)
I
I
A
d
d
a
n
d
s
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b
t
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a
c
t
t
h
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d
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g
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m
b
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s
I
A
d
d
a
n
d
s
u
b
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r
a
c
t
t
h
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d
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g
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t
n
u
m
b
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r
s
I
I
A
d
d
a
n
d
s
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b
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r
a
c
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f
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d
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g
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t
n
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m
b
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s
I
A
d
d
a
n
d
s
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b
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c
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f
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d
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b
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I
I
W
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p
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b
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I
I
U
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d
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P
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P
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C
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p
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k
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b
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u
p
t
o
1
0
0
A
d
d
3
n
u
m
b
e
r
s
(
m
i
x
o
f
s
i
n
g
l
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,
t
w
o
a
n
d
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d
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g
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n
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m
b
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s
)
A
d
d
a
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d
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b
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A
d
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I
I
W
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I
A
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d
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M
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V
A
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d
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A
b
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c
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s
(
I
n
v
e
s
t
i
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a
t
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o
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)
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Primary
Inequalities with addition and subtraction statements
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