一元二次方程练习题集
-
一元二次方程练习题集
1)x^2-9x+8=0
(2)x^2+6x-27=0
(3)x^2-2x-80=0
(4)x^2+10x-200=0
(5)x^2-20x+96=0
(6)x^2+23x+76=0
(7)x^2-25x+154=0
(8)x^2-12x-108=0
(9)x^2+4x-252=0
(13)x^2-9x+20=0
(17)x^2-5x-176=0
(21)x^2+13x-140=0
(25)x^2+14x+45=0
(29)x^2+9x-70=0
(33)x^2+19x+34=0
(37)x^2+20x+51=0
(41)x^2-13x-48=0
(10)x^2-11x-102=0
(14)x^2+19x+90=0
(18)x^2-26x+133=0
(22)x^2+13x-48=0
(26)x^2-9x-136=0
(30)x^2-1x-56=0
(34)x^2-6x-160=0
(38)x^2-9x+14=0
(42)x^2+10x+24=0
(11)x^2+15x-54=0
(15)x^2-25x+156=0
(19)x^2+10x-11=0
(23)x^2+5x-176=0
(27)x^2-15x-76=0
(31)x^2+7x-60=0
(35)x^2-6x-55=0
(39)x^2-29x+208=0
(43)x^2+28x+180=0
1
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(16)x^2-22x+57=0
(20)x^2-3x-304=0
(24)x^2+28x+171=0
(28)x^2+23x+126=0
(32)x^2+10x-39=0
(36)x^2-7x-144=0
(40)x^2+19x-20=0
(44)x^2-8x-209=0
(12)x^2+11x+18=0
(45)x^2+23x+90=0
(46)x^2+7x+6=0
(47)x^2+16x+28=0
(48)x^2+5x-50=0
(49)x^2+13x-14=0
(50)x^2-23x+102=0
(51)x^2+5x-176=0
(52)x^2-8x-20=0
(53)x^2-16x+39=0
(54)x^2+32x+240=0
(55)x^2+34x+288=0
(56)x^2+22x+105=0
(57)x^2+19x-20=0
(58)x^2-7x+6=0
(59)x^2+4x-221=0
1 x^2-6x+5=02
2.
x^2+4x-5=03
3.
4x^2-12x+5=0
4 x^2+4x+4=0
6
x^2+6x-7=0
7
x^2+3x-4=0
8
x^2+5x-6=0
9 a^2-5a+6=0
11
2x^2+5x-3=0
12 x^2-6x+8=0
13
x^2-4x-5=0
14
x^2-8x+15=0
16
4x^2-4x-3=0
17 x^2-6x+8=0
18
x^2-2x-8=0
19
x^2+2x-8=0
3x²
-1=0
X²
+12X+36=24
X²
-4X+1=8
4(6X-7)²
-9=0
X²
+1/6X-1/3=0
3x²
-5x=2
x²
+8x=9
x²
+12x-15=0
x²
+6x-27=0
x²
-2x-80=0
x²
+10x-200=0
x²
-20x+96=0
2
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(60)x^2+6x-91=0
5 2x^2-5x+2=0
10 c^2+3c-4=0
15 7x^2-8x+1=0
20
4x^2-12x-7=0
X²
+X-1=0
x²
-9x+8=0
x²
+23x+76=0
x²
-25x+154=0
x²
-12x-108=0
x²
+4x-252=0
x²
-11x-102=0
x²
+15x-54=0
x²
+11x+18=0
x²
-9x+20=0
x²
+19x+90=0
x²
-25x+156=0
x²
-22x+57=0
x²
-5x-176=0
x²
-26x+133=0
x²
+10x-11=0
x²
-3x-304=0
x²
+13x-140=0
x²
+13x-48=0
x²
-15x-76=0
x²
+10x-39=0
x²
+20x+51=0
x²
+10x+24=0
x²
+16x+28=0
x²
-16x+39=0
x²
-7x+6=0
x²
-18x+17=0
x²
+5x-176=0
x²
+28x+171=0
x²
+14x+45=0
x²
-9x-136=0
x²
+23x+126=0
x²
+9x-70=0
x²
-1x-56=0
x²
+7x-60=0
x²
+19x+34=0
x²
-6x-160=0
x²
-6x-55=0
x²
-7x-144=0
x²
-9x+14=0
x²
-29x+208=0
x²
+19x-20=0
x²
-13x-48=0
x²
+28x+180=0
x²
-8x-209=0
x²
+23x+90=0
x²
+7x+6=0
x²
+5x-50=0
x²
-23x+102=0
x²
+5x-176=0
x²
-8x-20=0
x²
+32x+240=0
x²
+34x+288=0
x²
+22x+105=0
x²
+19x-20=0
x²
+4x-221=0
x²
+6x-91=0
x²
+8x+12=0
x²
+7x-120=0
x²
+7x-170=0
x²
+6x+8=0
x²
+13x+12=0
x²
+24x+119=0
3
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x²
+11x-42=0
x²
+2x-289=0
x²
+13x+30=0
x²
-24x+140=0
x²
+4x-60=0
x²
+27x+170=0
x²
+27x+152=0
x²
-2x-99=0
x²
+12x+11=0
x²
+20x+19=0
x²
-2x-168=0
x²
-13x+30=0
x²
-10x-119=0
4
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p>
1.
方程
x
2
p>
=16
的根是
x
1
=______,
x
2
=_______.
2.
若
x
2
=225
,则
x
1
=_____,
x
2
=_______.
3.
若
x
2
-
2
x
=0
,则
x
1
=________,
x
2
=________.
4.
若
(
x
-
2)
2
=0
,则
< br>x
1
=________,
x<
/p>
2
=_______.
5.
若
9
x
2
-
25=0
,则
x
1
=________,
x
2
=_______.
6.
若-<
/p>
2
x
2
+8=0
,则
x
1
=_
_______,
x
2
=______
__.
二、选择题
1.
方程
5
x
2
+75=0
的根是(
)
A.5
2.
方程
3
x
2
-
1=0
的解是(
p>
)
A.
x
=
±
3.
方程
4
x
2
-
0.3=0<
/p>
的解是(
)
p>
A.
x
0
.
075
B.
x
B.
-
5
C.
±
5
D.
无实根
7.
若
x
2<
/p>
+4=0
,则此方程解的情况是
____
____.
8.
若
2
x
2
-
7=0
,则此方程的解的情况是
_______.
9.
p>
若
5
x
2
=0
,则方程解为
__________. <
/p>
10.
由
7
,<
/p>
9
两题总结方程
ax
2
+
c
=0(
a
≠
0)
的解的情况是:
当
ac
>
0
时
_________
;当
ac
=0
时
___________
___
;当
ac
<
0
时
__________________.
1
3
B.
x
=<
/p>
±
3C.
x
=<
/p>
±
3
3
D.<
/p>
x
=
±
3
1
30
C.
x
1
0
.
27
x
2
< br>0
.
27
20
D.
x
1
1
1
p>
30
30
x
2
p>
20
20
p>
4.
方程
35
7<
/p>
7
7
5
2
7
D
、
x
=
±
x
=0
的解是(
p>
)
A.
x
=
B.
x
=
±
C.
x
=
±
5
5
5
5
2
2
5.
< br>已知方程
ax
2
+
c
=0(
a
≠
0)
有实数根,则
a
与
p>
c
的关系是(
)
A.
c
=0
p>
B.
c
=0
或
p>
a
、
c
异号
C.
c
=0
或
a
、
c
同号
D.
c
是
a
的整数倍
6.
关于
x
的方程
(
x
+
m
)
2
=
n
,
下列说法正确的是
<
/p>
A.
有两个解
x
=
±
n
B.
当
n<
/p>
≥
0
时,有两个解
x
=
±
n
-
m
C.
当<
/p>
n
≥
0
时,有两
个解
x
=
±
n
m
D.
当<
/p>
n
≤
0
时,方程
无实根
7.
方程
(
x
-
2)
2
=(2
x
+3)
< br>2
的根是
A.
x
1
=
-
1
,
x
2
=
-
5
3
B.
x
1
=<
/p>
-
5,
x
2
p>
=
-
5C.
x
p>
1
=
1
,
x
2
=5
3
D.
x<
/p>
1
=5,
x
2<
/p>
=
-
5
三、解方程
(
1
)
x
2
=
4
p>
(2)
x
2
=16
(3)
2
x
2
=32
(4)
2
x
2
=8
2<
/p>
.
5
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