问题 解答题
x:18=0.51.8:x=
1
3
x:20=4:5
x
8
=
3
7
1
6
x+
2
3
x=
1
4
1
3
4
x-20=29
3
4
2
5
=
5
4
4x+5x=
8
11
x+
2
3
x=
10
9
3
4
x+20=50
x-
1
10
x=
3
4
1
2
x-
1
4
=
7
8
答案

x:18=0.5,

x=0.5×18,

x=9;

1.8:x=
1
3

x=1.8÷

1
3

x=5.4;

x:20=4:5

5x=20×4

5x÷5=80÷5

x=16;

x
8
=
3
7

7x=3×8,

7x÷7=24÷7,

x=

24
7
1
6
x+
2
3
x=
1
4

1
6
+
2
3
)x=
1
4

5
6
x÷
5
6
=
1
4
÷
5
6

x=

3
10
1
3
4
x-20=29

1

3
4
x-20+20=29+20

1

3
4
x÷
7
4
=49÷
7
4

x=28

3
4
2
5
=
5
4

3
4
2
5
×
2
5
=
5
4
×
2
5

3
4
x=
1
2

3
4
3
4
=
1
2
÷
3
4

x=

2
3
4x+5x=
8
11

9x=

8
11

9x÷9=

8
11
÷9

x=

8
99
x+
2
3
x=
10
9

1

2
3
5
3
=
10
9
÷
5
3

x=

10
9
×
3
5

x=

2
3
3
4
x+20=50

3
4
x+20-20=50-20

3
4
x÷
3
4
=30÷
3
4

x=40

x-
1
10
x=
3
4

(1-

1
10
)x=
3
4

9
10
9
10
=
3
4
÷
9
10

x=

5
6
1
2
x-
1
4
=
7
8

1
2
x-
1
4
+
1
4
=
7
8
+
1
4

1
2
1
2
=
9
8
÷
1
2

x=

9
4

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