Question

解方程：
x÷

1

2

=

2

3

x-

1

3

x=20

1

3

x÷

1

4

=12．

Answer 1

①x÷

1

2

=

2

3

x=

2

3

×

1

2

x=

1

3

；

②x-

1

3

x=20

2

3

x=20

2

3

x×

3

2

=20×

3

2

x=30；

③

1

3

x÷

1

4

=12

1

3

x=12×

1

4

1

3

x×3=3×3
x=9．