精选 一元一次方程50道练习题(含答案)
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精选一元一次方程50道练习题
(1)
2x1
1
2
x4
;
(2)
0.8x0.10.5x0.7
;
(3)
1
2
x42x3
5
2
x
;
(4)
3x17x
3
6
;
(5)
x12
4
1
x3
6
x1
3
;
(6)
32123
2
[
3
(
2
x1)
2]
3
2
x
;
(7)
2[1
1<
br>3
(x
1x
3
)]
1103x
2
(
2x
3
)
(8)
1
2
(2x3)
111
3
(2x4)
4
(2x5)
5
(2x6)
.
(9)5
x
+2=7
x
-8;
(10)
7
2x1
3
4x1
2
3x2
10
;
(11)
5x1
6
7
3
;
(
12)
7
2
2y1
1
2
12y
2
3
2y1
;
(13)
2x1
6
x21
6
2
;
(14)
3
2
2
3
2x1
2
x2
;
(15)
1
2
x
3
1
2
3x
2<
br>1
x
1
2
;
(16)
341
4
[
3
(
2
x
1
4
)8]
3
2
x1
;
(
17)
7x12(
5
3
x
1
2
)8
2
3
(6x9)
;
)
x
218x
(18
6
x
9
2
;
2
(19)
(
x1)30%(100x)25%
5
x
;
23x5
(
20)
2
xx
3
4
2
.
(21)
1
1
1
1
6
4
3
2
x1
3
5
1
22)2(2x-1)-4(4x-1)-5(2x+1)-19=0 23)
3x13x
3
1
5
4
x4
1
6
2
2
24)
0.4x0.90.1x0.50
.03
0.5
0.2
0.02x
0.03
25)
3
2
[
2
3
(
1
4
x1)2]2
12x
2
3
26)2{3[4(5x-1)-8]-20}-7=1
(
(
(
(
(
(27)2(0.3x-4)-5(0.2x+3)=9
(28)2[(x+3)-2(x+1)]-5=0
(29)3x-
2(x3)
x2x2
3
16
2
6
(30)
x3x4
0.15
0.2
1.6
(31)
1
9
{
1
7
[
1
5(
x2
3
4)6]8}1
(32)3x=2x+5
(33)2y+3=y-1
(34)7y=4-3y
(35)-
2
5
y
=
1
3
(36)10x+7=12x-5-3x
(37)8x―4+2x= 4x―3
(38).2(3x+4)=6-5(x-7)
.
x2x
2
45x12
3
1
6
x
1
2
[x
1
2
(x
1
2
)]2
2(2x1)0.2
0.01
2.5
20x
0.2
3.5
42)
(x5)
x2x34x
2
3
5
<
br>43)
4x1.5
0.5
5x0.8
0.2
1.2x
0.1
3
1xx2
3
=
6
-1
(45). <
br>0.4y0.9y50.30.2
0.5
-
2
=
y0.3
(46) 3(x+2)-
11
3
(2x-3)=2
(2x-3)-
2
(x+2)
(47).
1111
3
{
3
[
3
(
3
x-2)-2]}-2=0
(48)、5(
y
+8)―5 = 4(2
y
―7);
(49)、
233x
3
x
2
(1
23x<
br>3
)
6
;
(50)、
1.88x1.33x5x0
.4
1.2
2
0.3
;
答案:(1)
x
=2;(2)
x
=—2;(3)
x
=7;(4)
x
=1;
(5)
x
=—5;(6)
x
=
3
121
3
;(7)
x
=
7
;(8)
x
=
2
.
(9)x
=5;(10)
x
7
8
;(11)
x
=3
;(12)
y
1
2
;
(13)
x
=0;(14
)
x
=6;(15)
x
61
7
;(16)
x
7
4
.
17.
x
8
9
18.
x
3
5
19
x
22530
35
506
7
20
x
16
25
21.
x
=8
22.x=-1 23.x=-3 24.x=9
25.x=
18
5
26.x=1 27、x=-80
28、x=-
3
2
29、
52
9
30、24.96 31、x=1
(39)
(40)
(41)
(
(
(44).
x-
32)x=5 33)y=-4
34)y=
37)x=
1
6
25
35)y=-
36)x=-12
56
7172
40.x=
41.
x
265
(42)
x
=6 ;
(43)
x
=-2 ;
38.x=3
39.x=-
44.
x
2
7
45.
48、
y
= 21 49
y9
46.
x12
47. x=186
、
x
=
11
2
;
50、
x
=
10
;