题目内容

解方程:
1
4
+2x=
1
2
72
100
×3-7x=1.04
1
2
x-1-
1
3
x=2
x-
2
9
x=14
3x-
3
4
x=
18
19
x
72
=
0.26
2.4
1.2:
2
3
=
x
5
18
x
=
3
10
3
15
1
20
1
5
=x:0.8
3
4
=
5
6
+1
(1)
1
4
+2x=
1
2

1
4
+2x-
1
4
=
1
2
-
1
4

2x=
1
4

2x÷2=
1
4
÷2,
x=
1
8


(2)
72
100
×3-7x=1.04,
2.16-7x=1.04,
2.16-7x-1.04=1.04-1.04,
1.12-7x=0,
7x÷7=1.12÷7,
x=0.16;

(3)
1
2
x-1-
1
3
x=2,
1
6
x-1=2,
1
6
x-1+1=2+1,
1
6
x=3,
1
6
x÷
1
6
=3÷
1
6

x=18;

(4)x-
2
9
x=14,
7
9
x=14,
7
9
x÷
7
9
=14÷
7
9

x=18;

(5)3x-
3
4
x=
18
19

9
4
x=
18
19

9
4
x÷
9
4
=
18
19
÷
9
4

x=
8
19


(6)
x
72
=
0.26
2.4

2.4x=72×0.26,
2.4x=18.72,
2.4x÷2.4=18.72÷2.4,
x=7.8;

(7)1.2:
2
3
=
x
5

2
3
x=1.2×5,
2
3
x=6,
2
3
x÷
2
3
=6÷
2
3

x=9;

(8)
18
x
=
3
10
3
15

3
10
x=18×
3
15

3
10
x=
18
5

3
10
x÷
3
10
=
18
5
÷
3
10

x=12;

(9)
1
20
1
5
=x:0.8,
1
5
x=
1
20
×0.8,
1
5
x÷
1
5
=0.04÷
1
5

x=0.2;

(10)x÷
3
4
=
5
6
+1,
x÷
3
4
×
3
4
=
11
6
×
3
4

x=1
3
8
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