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Naturlige, lige og ulige tal
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Expression 14: "k" equals "x" squared plus "x"
k
=
x
2
+
x
14
ingen løsninger under de givne
ingen løsninger under de givne
15
forudsætninger. Kort sagt: Hvis
forudsætninger. Kort sagt: Hvis
16
x ( x + 1 ) er et lige tal, og k er
x ( x + 1 ) er et lige tal, og k er
17
et ulige tal, vil x ( x + 1 ) være
et ulige tal, vil x ( x + 1 ) være
18
forskellig fra k.
forskellig fra k.
19
Nu mangler vi kun at føre bevis
Nu mangler vi kun at føre bevis
20
for, at produktet af et naturligt
for, at produktet af et naturligt
21
lige (med 2 deleligt) tal ( 2n ) og
lige (med 2 deleligt) tal ( 2n ) og
22
et naturligt, ulige tal ( 2n + 1 )
et naturligt, ulige tal ( 2n + 1 )
23
altid er et lige tal:
altid er et lige tal:
24
Expression 25: 2 "n" left parenthesis, 2 "n" plus 1 , right parenthesis
2
n
2
n
+
1
equals
=
42
4
2
25
Expression 26: 4 "n" squared plus 2 "n"
4
n
2
+
2
n
equals
=
42
4
2
26
Expression 27: "n" equals 3
n
=
3
1
1
10
1
0
27
Diverse linjer
Diverse linjer
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left parenthesis, "n" , left parenthesis, "n" squared plus "n" , right parenthesis , right parenthesis
n
,
n
2
+
n
"x"
x
"y"
y
"a" squared
a
2
"a" Superscript, "b" , Baseline
a
b
7
7
8
8
9
9
over
÷
functions
(
(
)
)
less than
<
greater than
>
4
4
5
5
6
6
times
×
| "a" |
|
a
|
,
,
less than or equal to
≤
greater than or equal to
≥
1
1
2
2
3
3
negative
−
A B C
StartRoot, , EndRoot
pi
π
0
0
.
.
equals
=
positive
+
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