① 15 16 ÷ 3 8 ÷ 5 6 ② 9 13 ÷ 15 26 × 5 6 ③ 3 5 ÷3+ 1 3 × 4 5
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(1)

15

16 ÷

3

8 ÷

5

6 ,

=

15

16 ×

8

3 ÷

5

6 ,

=

5

2 ×

6

5 ,

=3;

(2)

9

13 ÷

15

26 ×

5

6 ,

=

9

13 ×

26

15 ×

5

6 ,

=1;

(3)

3

5 ÷3+

1

3 ×

4

5 ,

=

3

5 ×

1

3 +

1

3 ×

4

5 ,

=

1

3 ×

7

5 ,

=

7

15 ;

(4)(

1

2 +

3

8 )÷

3

4 ;

=

7

8 ×

4

3 ,

= 1

1

6 ;

(5)

3

10 ÷x=

3

5 ;

3

5 x=

3

10 ,

3

5 x÷

3

5 =

3

10 ÷

3

5 ,

x=

1

2 ;

(6)(1-

3

4 )x=2,

1

4 x=2,

1

4 x÷

1

4 =2÷

1

4 ,

x=8.

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