用自己喜欢的方法计算(1) 7 13 -0.4+ 6 13 - 3 5 (2) 5 6 × 14 15 ÷ 7 8 (3
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(1)

7

13 -0.4+

6

13 -

3

5 ,

=(

7

13 +

6

13 )-(0.4+0.6),

=1-1,

=0;

(2)

5

6 ×

14

15 ÷

7

8 ,

=

5

6 ×

14

15 ×

8

7 ,

=

8

9 ;

(3)(

3

8 +

7

16 )÷

13

16 ,

=

3

8 ×

16

13 +

7

16 ×

16

13 ,

=

6

13 +

7

13 ,

=1;

(4)20-[(

1

2 +

1

3 )÷

5

6 ]×1.2,

=20-[

5

6 ×

6

5 ]×1.2,

=20-1×1.2,

=20-1.2,

=18.8;

(5)

97

98 ×99,

=

97

98 × (98+1),

=

97

98 × 98 +

97

98 ×1,

=97 +

97

98 ,

=97

97

98 ;

(6)2007×(1-

1

2 )×(1-

1

3 )×(1-

1

4 )×…×(1-

1

2007 ),

=2007×

1

2 ×

2

3 ×

3

4 ×…×

2005

2006 ×

2006

2007 ,

=2007×

1

2007 ,

=1.

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