分式方程专项练习50题(有答案)
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分式方程专项练习50题(有答案)
13
(1) =
xx+2
2x
1
x1
2x1
(3)
4
1x
(2)
5x-3
(4)+=0
xx
(5)
(6)
21
x12
21
0
x1x1
13
xx2
(7)
(8)
x1
1
x1x1
2x53
(9)
x22x
(10)
2x1
1
x1x1
x43x
2
2
x
1
(11)
xx
(12)
(13)
(14)
(15)
(16)
3x1
2x4x22
2x2
1
2x52x5
x11
-=
x-3
2x-62
4x3
1
x22x
2x
1
xx3
3x
2
12
2x
(17)
x2
(18)
(19)
(20)
(21)
(22)
(23)
(24)
32
1
x3x1
x2
-
2
=1
x-2x-4x+4
24
=
2
x1
x1
2x5
=1
2x55x2
105
=2
2x112x
23x3
2
x1x1x1
x2x1
1
x1x
(25)
(26)
xx1
2
x1x
32
xx1
2x
2
1
(27)
2x
x2
x1
1
. .
(28)
x1x
(29)
23
0
.
x2x
x2
3
-=0
x1
x(x1)
12
x1x1
(30)
(31)
(32)
x24
2
1
x2x4
316
2
x1x1x1
(33)
23
x1x1
124
(26)(35)
2
x1x1x1
(34)
x2x
1
x13x3
3x1
(37)
1
x44x
(36)
(38)
.
(39)
(40)
(41)
(42)
x5
1
2x552x
x14
2
1
x1
x1
mn
0(mn,mn0)
.
xx1
11
x
2
5x6
x
2
x6
2x1
10
x33x
(43)
(44)
3x1
2x4x22
x2x
= +1
x+13x+3
(45)
2y3y1
1
y1y
x+4
3
(46) =
x(x-1)x-1
(47)
|x|5
=0
2
x5x
x2
x22x
(48)
x
(49)
114
2
x3x3x9
111
x
y
3
(50)
11
2
xy9
(51)
答案:
13
(1) = x=1
xx+2
(2)
x2x4x6x8
x1x3x5x7
2x
1
x=-1
x1
(3)
2x11
4
x
2
1x
5x-3
(4)+=0
x=﹣2
xx
(5)
(7)
21
x=5
x12
21
0
x=3
x1x1
13
x1
xx2
(7)
(8)
(9)
(10)
x1
1
x=0
x1x1
2x53
x1
x22x
2x1
x=2
1
x1x1
x43x
2
2
x1
x4
(11)
xx
(12)
(13)
(14)
(15)
(16)
5
3x1
x
3
2x4x22
2x2
35
1
x=
2x52x5
6
x11
-= x=-2
x-3
2x-62
4x35
x=
1
x22x3
2x
1
x=6
xx3
3x
2
12
(17)
2x
x6
x2
(18)
(19)
(20)
323
x=
1
5
x3x1
x2
-
2
=1
x=3.
x-2x-4x+4
24
=
2
x1
x1
x=1是原方程的增根,原方程无解.
(22)
(22)
(27)
(28)
(25)
(26)
7
2x5
=1
x=
2x55x23
1057
=2 x=.
4
2x112x
23x3
2
x=1是增根.所以原方程无解.
x1x1x1
1
x2x1
x
1
2
x1x
1
xx1
2
x
2
x1x
32
x3
.
xx1
1
2x
2
1
(27)
2x
x
4
x2
x11
1
.
x
.
2
(28)
x1x
(29)
23
0
. x
=6
x2x
x2
3
-=0
x1
x(x1)
(30)
检验x=1 是原方程的增根
所以,原方程无解
(31)
(32)
12
x3
.
x1x1
x24
2
1
x3
x2x4
316
x2
2
x1x1x1
(33)
23
x=5
x1x1
124
(35)
x=1是增根.所以原方程无解.
2
x1x1x1
(34)
x2x3
1
x
x13x32
3x1
(37)x=3
1
x44x
(36)
(38)
.
(39)
(40)
(41)
(43)
(43)
(44)
x5
x=0
1
2x552x
x14
2
1
x1
为增根,此题无解;
x1
x1
mn
m
.
0(mn,mn0)
.
x
nm
xx1
11
x=3
22
x5x6xx6
2x1
10
x=2
x33x
3x15
x
3
2x4x22
x2x
3
= +1 x=-
x+13x+32
(45)
2y3y1
1
1
y
y1y
3
x+4
3
(46) =
x=2
x(x-1)x-1
(47)
|x|5
=0
x=5
x
2
5x
(48)
x
(49)
x2
x1
x22x
114
x=2
2
x3x3x9
111
x
y
3
(50)
112
xy9
(51)
3
x
2
3
x
1
2
,
3
y
2
2
y
1
3
<
br>x2x4x6x8
x1x3x5x7
1111
111
x1x3x5x7
1111
x1x3x5x7
原方程化为
1
方程两边通分,得
22
(x1)(x3)(x5)(x7)
(x5)(x7)(x13)(x)
化简得
8
x32
解得
x
4
经检验:
x
是原方程的根。
4