(完整)九年级数学解一元二次方程专项练习题(带答案)【40道】
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解一元二次方程专项练习题(带答案)
1、用配方法解下列方程:
12x+25=0
(2)
x+4x=10
(1)
x+
22
11
(4)
x-2x-4=0
(3)
x-6x=
22
2、用配方法解下列方程:
(1)
6x
2
-7x+1=0
(3)
4x
2
-3x=52
3、用公式法解下列方程:
(1)
2x
2
-9x+8=0
(3)
16x
2
+8x=3
4、运用公式法解下列方程:
(1)
5x
2
+2x-1=0
(3)
5x+2=3x
2
5、用分解因式法解下列方程:
(1)
9x
2
+6x+1=0
(3)
(2x+3)
2
=4(2x+3)
6、用适当方法解下列方程:
(1)
(3x)
2
x
2
5
(2)
5x
2
-18=9x
(4)
5x
2
=4-2x
2)
9x
2
+6x+1=0
4)
2x
2
-4x-1=0
(2)
x
2
+6x+9=7
4)
(x-2)(3x-5)=1
(2)
3x(x-1)=2-2x
(4)
2(x-3)
2
=x
2
-9
(2)
x
2
23x30
(
(
(
(3)
(3x11)(x2)2
;
(4)
7、 解下列关于x的方程:
x(x1)(x1)(x2)
1
34
(1)
x
2
+2x-2=0 (2)
3x
2
+4x-7=
(3) (x+3)(x-1)=5
(4) (x-
2
)
2
+4
2
x=0
8、解下列方程(12分)
(1)用开平方法解方程:
(x1)4
(2)用配方法解方程:x
2
—4x+1=0
(3)用公式法解方程:3x
2
+5(2x+1)=0
(4)用因式分解法解方程:3(x-5)
2
=2(5-x)
9、用适当方法解下列方程:
2
12x+27=0
(1)
x(x-14)=0
(2)
x+
(3)
x=x+56
(4)
x(5x+4)=5x+4
(5)
4x-45=31x
(6)
-3x+22x-24=0
22
2
2
1)=-12
(8)
(3x+2)(x+3)=x+14
(7)
(x+8)(x+
解一元二次方程专项练习题 答案
1、【答案】
(1)
-611
; (2)
-214
; (3)
325
; (4)
15
2、【答案】
1
,
x
2
=
(2)
x
1
=3
,
x
2
=-
(1)
x
1
=
1
6
6
5
(3)
x
1
=4
,
x
2
=-
3、【答案】
(1)
x=
-121
13
(4)
x=
5
4
917
1
(2)
x
1
=x
2
=-
4
3
(3)
x
1
=
,
x
2
=-
(4)
x=
4、【答案】
(1)
x
1
=
1
4
3
4
26
2
1616
,x
2
(2).
x
1
=-3+
7
,x
2
=-3-
7
55
(3)
x
1
=2
,
x
2
=-
(4)
x=
5、【答案】
1
3
1113
6
1
,
x
2
=-
(1)
x
1
=x
2
=-
(2)
x
1
=
(3)
x
1
=-
,
x
2
=
(4)
x
1
=3
,
x
2
=9
1
3
2
3
3
2
1
2
6、【答案】
1
,
x
2
=2
(2)
x
1
=x
2
=-3
(1)
x
1
=
5
(3)
x
1
,x
2
4
;
(4)
x
1
2,x
2
3
3
7、【答案】
(1)x=-1±
3
;
(2)x
1
=1,x
2
=-
7
3
(3)x
1
=2,x
2
=-4;
(4)25.x
1
=x
2
=-
2
8、【答案】
解:(1)
x
1
3,x
2
1
(2)
x
1
23,x
2
23
(3)
x
1
510510
13
,x
2<
br>
(4)
x
1
5,x
2
。
33
9、【答案】
(1)
x
1
=0
,
x
2
=14
(3)
x
1
=-7
,
x
2
=8
(5)
x
5
1
=9
,
x
2
=-
4
(7)
x
1
=-4
,
x
2
=-5
3
2)
x
1
=-3
,
x
2
=-9
4)
x
4
1
=1
,
x
2
=-
5
6)
x
4
1
=6
,
x
2
=
3
8)
x
1
=-4
,
x
2
2
=
3
(
(
(
(
解一元二次方程专项练习题 答案
1、【答案】
(1)
-611
; (2)
-214
; (3)
325
; (4)
15
2、【答案】
1
,
x
2
=
(2)
x
1
=3
,
x
2
=-
(1)
x
1
=
(3)
x
1
=4
,
x
2
=-
3、【答案】
(1)
x=
1
6
6
5
-121
13
(4)
x=
5
4
917
1
(2)
x
1
=x
2
=-
4
3
(3)
x
1
=
,
x
2
=-
(4)
x=
4、【答案】
(1)
x
1
=
1
4
3
4
26
2
1616
,x
2
(2).
x
1
=-3+
7
,x
2
=-3-
7
55
(3)
x
1
=2
,
x
2
=-
(4)
x=
5、【答案】
1
3
1113
6
1
,
x
2
=-
(1)
x
1
=x
2
=-
(2)
x
1
=
(3)
x
1
=-
,
x
2
=
(4)
x
1
=3
,
x
2
=9
1
3
2
3
3
2
1
2
6、【答案】
1
,
x
2
=2
(2)
x
1
=x
2
=-3
(1)
x
1
=
5
(3)
x
1
,x
2
4
;
(4)
x
1
2,x
2
3
3
7、【答案】
(1)x=-1±
3
;
(2)x
1
=1,x
2
=-
7
3
(3)x
1
=2,x
2
=-4;
(4)25.x
1
=x
2
=-
2
8、【答案】
解:(1)
x
1
3,x
2
1
(3)
x
510
1
3
,x
510
2
3
9、【答案】
(1)
x
1
=0
,
x
2
=14
(3)
x
1
=-7
,
x
2
=8
(5)
x
1
=9
,
x
5
2
=-
4
(7)
x
1
=-4
,
x
2
=-5
2)
x
1
23,x
2
23
(4)
x
13
1
5,x
2
3
。
(2)
x
1
=-3
,
x
2
=-9
(4)
x
4
1
=1
,
x
2=-
5
(6)
x
4
1
=6,
x
2
=
3
(8)
x
1
=-4
,
x
2
2
=
3
(