Basic HTML Version
Unita` B
Equazioni e sistemi di equazioni
21
44
x
2
6
x
þ
9
¼
0
[3, 3]
45
x
2
þ
8
x
þ
18
¼
0
[Impossibile]
46
2
x x
1
ð
Þ ¼
3
1
ffiffi
7
p
2
"
#
47
x
2
1
2
3
x
¼
5
3 2
ffiffi
5
p
h
i
48
x
þ
5
ð
Þ
2
¼
16
[Impossibile]
49
x
2
ð
Þ
2
¼
9
1, 5
½
50
x
2
8
x
þ
7
¼
0
[1, 7]
51
x
2
x
2
¼
0
1, 2
½
52
4
x
2
4
x
þ
1
¼
0
1
2
,
1
2
53
x
2
þ
2
x
þ
2
¼
0
[Impossibile]
54
x
2
7
x
þ
12
¼
0
[3, 4]
55
x
2
þ
7
x
þ
10
¼
0
2, 5
½
56
9
x
2
þ
6
x
þ
1
¼
0
1
3
,
1
3
57
9
x
2
6
x
þ
1
¼
0
1
3
,
1
3
58
3
x
2
x
2
¼
0
2
3
, 1
59
x
2
4
x
¼
21
3, 7
½
60
6
x
2
þ
x
1
¼
0
1
2
,
1
3
61
2
x
2
2
x
þ
1
¼
0
[Impossibile]
62
x
2
þ
4
¼
4
x
[2, 2]
63
4
x
2
þ
1
þ
4
x
¼
0
1
2
,
1
2
64
x
2
2
x
4
¼
0
4, 2
½
65
x
2
þ
x
2
3
¼
0
2
3
, 1
66
x
2
þ
2
x
þ
5
¼
0
[Impossibile]
67
x
2
2
ffiffi
2
p
x
þ
2
¼
0
ffiffi
2
p
,
ffiffi
2
p
68
x
þ
1
ð
Þ
2
¼
25
6, 4
½
69
x x
2
ð
Þ ¼
15
5, 3
½
70
x
1
x
ð
Þ ¼
6
3, 2
½
71
x
þ
2
ð
Þ
2
¼
9
[Impossibile]
72
x
1
2
þ
x
2
þ
1
3
¼
1
1
3
1,
5
2
73
x
þ
2
ð
Þ
x
2
ð
Þ þ
x
1
ð
Þ
2
¼
5
1
ffiffiffiffiffi
17
p
2
,
1
þ
ffiffiffiffiffi
17
p
2
"
#
74
ð
2
x
Þ
2
þ
10
¼
5
x
þ
16
x x
2
28
6
[2, 8]
75
2
x
1
ð
Þ
2
x
þ
1
ð
Þ þ
x
¼
2
x
1
þ
4
x
ð
Þ
3
4
,
1
2
76
10
x
5
6
x
2
þ
x
4
¼
x
5
12
1
3
, 5
77
x
2
4
6
ð
x
þ
2
Þ
2
4
þ
4
x
þ
4
3
¼
0
[2, 2]
78
ð
x
1
Þ
2
¼
x
4
12
2
8
11
,
16
13
79
x x
2
ð
Þ þ
x x
6
ð
Þ þ
43
¼
7
x x
þ
5
ð
Þ
x
5
ð
Þ
[2, 3]
80
3
x
3
ffiffi
2
p
1
¼
x
2
þ
x
þ
1
1
þ
ffiffi
2
p
ffiffi
2
p
,
ffiffi
2
p þ
4
81
x
2
ffiffi
3
p
x
þ
ffiffi
3
p
1
¼
0
ffiffi
3
p
1, 1
82
x
2
3
ffiffi
3
p
x
þ
5
ffiffi
3
p ¼
0
ffiffi
3
p
1, 2
ffiffi
3
p þ
1
83
x
2
2
ð
2
ffiffi
5
p
Þ
x
þ
9 4
ffiffi
5
p
¼
0
2
ffiffi
5
p
, 2
ffiffi
5
p
h
i