Basic HTML Version
Unita` A
Insiemi numerici e calcolo letterale
15
Scrivi le condizioni di esistenza e semplifica le seguenti frazioni algebriche letterali.
104
a
1
a
a
2
þ
a
þ
1
2
a
a
2
a
3
1
1
a
105
2
x
2
x
2
6
x
þ
5
ð
x
5
Þ
2
4
x
2
x
2
y
5
x
xy
½
106
a
6
a
5
b
5
b
4
b
3
b
2
a
4
a
3
ð
1
Þ
a
2
b
2
107
ð
a
þ
b
Þ
2
1
ð
a b
Þ
2
1
ð
a
1
Þ
2
b
2
ð
a
þ
1
Þ
2
b
2
a
þ
b
1
ð
Þ
2
a b
þ
1
ð
Þ
2
"
#
108
x
x
2
þ
xy
x
y
þ
1 1
x
y
y
2
y x
½
1
109
y
x
1
x
2
2
x
þ
1
y
3
ð
x
þ
1
Þ
y
2
x
1
1
þ
x
½
110
x
2
þ
3
x
þ
2
x
2
þ
x
2
þ
4
x
2
1
x
2
3
x
þ
2
x
2
x
2
:
4
x
5 5
x
þ
20
3
x
2
25
9
x
2
111
x
1
1
þ
x
þ
1
þ
x
1
x
1
x
ð
1
þ
x
Þ
2
x
2
þ
x
ð
2
þ
x
Þ
x
3
"
#
:
½ð
x
2
þ
1
Þ
2
ð
x
2
1
Þ
2
x
3
½
1
112
b
a
þ
b
a
a b
:
b
b a
a
a
þ
b
:
1
4
a
þ
2
b
a
þ
b
:
b
a
þ
b
1
a
3
a
þ
b
113
a
a
þ
b
:
a
a
2
b
2
1
a
þ
b
1
a b
b a
½
114
1
þ
b
a
:
1
þ
b
a
2
a
a b
:
a
2
þ
b
2
b a
a
þ
b
½
115
y
b
x
b
þ
2
a
þ
a
2
b
x y
x y
b
:
ab
x y
1
3
a
½
116
1
x
þ
1
x
2
þ
1
x
3
1
1
x
3
1
1
1
x
117
1
a
2
b
þ
2
2
a
þ
b
2
a
a
2
1
1
a
1
1
a
þ
1
½
0
118
a
2
þ
1
a
2
3
a
4
a
þ
1
a
4
2
:
1
a
4
2
4
a
2
a
þ
1
ð
Þ
2
"
#
119
x
3
y
2
x
2
y
þ
y
3
x
2
x y
x
3
y
2
:
y
2
x
2
þ
y
x
þ
1
2
ð
y x
Þ
"
#
½
0
120
1 1
1
a
:
1
þ
1
a
:
1
a
þ
1
þ
a
1
a
:
1
1
a
a
a
þ
1
2
1
þ
a
121
x
1
x
2
þ
1
x
1
þ
1
x
þ
1
:
x
x
1
x
2
1
þ
x
2
þ
x
2
x
2
1
x
4
þ
2
x
2
1
x
4
1
x
x
þ
1
122
3
4
a
2
þ
4
a
þ
4
3 3
a
4
a
ð
a
3
1
Þ
:
a
4
a
þ
3
4
a
2
þ
a
3
þ
3
a
þ
3
a
2
1
3
ð
a
1
Þ
½
1