问题 解答题
解下列方程:
(1)
x-2
x+3
=
3
4

(2)
3
x-1
=
4
x

(3)
300
x
-
480
2x
=4
(4)
x
2x-5
+
5
5-2x
=1
(5)
1
x-2
+3=
1-x
2-x

(6)
2x+9
3x-9
=
4x-7
x-3
+2
(7)
2
1-x2
=
3
1+x

(8)
1
x-1
=
x-2
x+1
-1
(9)
2x
x-1
+
2
x+2
=2
(10)
3-2x
1-x
-1=
x+2
x-3

(11)
x-1
x+1
-
x
x-1
=
4
x2-1
答案

(1)去分母得:4x-8=3x+9,

解得:x=17,

经检验x=17是分式方程的解;

(2)去分母得:3x=4x-4,

解得:x=4,

经检验x=4是分式方程的解;

(3)去分母得:600-480=8x,

解得:x=15,

经检验x=15是分式方程的解;

(4)去分母得:x-5=2x-5,

解得:x=0,

经检验x=0是分式方程的解;

(5)去分母得:1+3x-6=x-1,

解得:x=4,

经检验x=4是分式方程的解;

(6)去分母得:2x+9=12x-21+6x-18,

解得:x=3,

经检验x=3是分式方程的解;

(7)去分母得:2=3(1-x),

解得:x=

1
3

经检验是分式方程的解;

(8)去分母得:x+1=(x-2)(x-1)-x2+1,

解得:x=

1
2

经检验是分式方程的解;

(9)去分母得:2x(x+2)+2(x-1)=2(x-1)(x+2),

整理得:x=-

1
2

经检验是分式方程的解;

(10)去分母得:(3-2x)(x-3)-(1-x)(x-3)=(1-x)(x+2),

整理得:3x-9-2x2+6x-x+3+x2-3x=x+2-x2-2x,即6x=11,

解得:x=

11
6

经检验是分式方程的解;

(11)去分母得:(x-1)2-x(x+1)=4,

整理得:x=-1,

经检验x=-1是增根,原分式方程无解.

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单项选择题