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Bµi tËp vµ ®¸p ¸n
Bµi tËp
1: Gi¶i c¸c ph¬ng tr×nh bËc hai sau:
TT
PTBH
TT
PTBH
1
x
2
- 11x + 30 = 0
41
x
2
- 16x + 84 = 0
2
x
2
- 10x + 21 = 0
42
x
2
+ 2x - 8 = 0
3
x
2
- 12x + 27 = 0
43
5x
2
+ 8x + 4 = 0
4
5x
2
- 17x + 12 = 0
44
x
2
– 2(
)
2
3
x + 4
6
= 0
5
3x
2
- 19x - 22 = 0
45
11x
2
+ 13x - 24 = 0
6
x
2
- (1+
2
)x +
2
= 0
46
x
2
- 11x + 30 = 0
7
x
2
- 14x + 33 = 0
47
x
2
- 13x + 42 = 0
8
6x
2
- 13x - 48 = 0
48
11x
2
- 13x - 24 = 0
9
3x
2
+ 5x + 61 = 0
49
x
2
- 13x + 40 = 0
10
x
2
-
3
x - 2 -
6
= 0
50
3x
2
+ 5x - 1 = 0
11
x
2
- 24x + 70 = 0
51
5x
2
+ 7x - 1 = 0
12
x
2
- 6x - 16 = 0
52
3x
2
- 2
3
x - 3 = 0
13
2x
2
+ 3x + 1 = 0
53
x
2
- 2
2
x + 1 = 0
14
x
2
- 5x + 6 = 0
54
x
2
- 2
1
3
x - 2
3
= 0
15
3x
2
+ 2x + 5 = 0
55
11x
2
+ 13x + 24 = 0
16
2x
2
+ 5x - 3 = 0
56
x
2
+ 13x + 42 = 0
17
x
2
- 7x - 2 = 0
57
11x
2
- 13x - 24 = 0
18
3x
2
- 2
3
x - 2 = 0
58
2x
2
- 3x - 5 = 0
19
-x
2
- 7x - 13 = 0
59
x
2
- 4x + 4 = 0
20
2
x
2
– 2(
)
1
3
x -3
2
= 0
60
x
2
- 7x + 10 = 0
21
3x
2
- 2x - 1 = 0
61
4x
2
+ 11x - 3 = 0
22
x
2
- 8x + 15 = 0
62
3x
2
+ 8x - 3 = 0
23
2x
2
+ 6x + 5 = 0
63
x
2
+ x + 1 = 0
24
5x
2
+ 2x - 3 = 0
64
x
2
+ 16x + 39 = 0
25
x
2
+ 13x + 42 = 0
65
3x
2
- 8x + 4 = 0
26
x
2
- 10x + 2 = 0
66
4x
2
+ 21x - 18 = 0
27
x
2
- 7x + 10 = 0
67
4x
2
+ 20x + 25 = 0
28
5x
2
+ 2x - 7 = 0
68
2x
2
- 7x + 7 = 0
29
4x
2
- 5x + 7 = 0
69
-5x
2
+ 3x - 1 = 0
30
x
2
- 4x + 21 = 0
70
x
2
- 2
3
x - 6 = 0
31
5x
2
+ 2x -3 = 0
71
x
2
- 9x + 18 = 0
32
4x
2
+ 28x + 49 = 0
72
3x
2
+ 5x + 4 = 0
33
x
2
- 6x + 48 = 0
73
x
2
+ 5 = 0
34
3x
2
- 4x + 2 = 0
74
x
2
- 4 = 0
35
x
2
- 16x + 84 = 0
75
x
2
-
2x = 0
36
x
2
+ 2x - 8 = 0
76
x
4
- 13x
2
+ 36 = 0
37
5x
2
+ 8x + 4 = 0
77
9x
4
+ 6x
2
+ 1 = 0
38
x
2
– 2(
)
2
3
x + 4
6
= 0
78
2x
4
+ 5x
2
+ 2 = 0
39
x
2
- 6x + 8 = 0
79
2x
4
- 7x
2
- 4 = 0
40
3x
2
- 4x + 2 = 0
80
x
4
- 5x
2
+ 4 = 0
Bµi tËp
2. T×m x, y trong c¸c trêng hîp sau:
a)
x + y = 17, x.y = 180
e)
x
2
+ y
2
= 61 , x.y = 30
b)
x + y = 25, x.y = 160
f)
x - y = 6, x.y = 40
c)
x + y = 30, x
2
+ y
2
= 650
g)
x - y = 5, x.y = 66
Để tải trọn bộ chỉ với 50k, vui lòng liên hệ qua Zalo 0898666919 hoặc Fb: Hương Trần