Question

下面各题怎样简便就怎样算．
6.3×8.7+8.7×3.7
（

1

3

-

1

6

+

1

4

）×12

7

4

×

5

8

+

1

4

÷

8

5

3÷

3

7

-

3

7

÷3

9

20

÷[

1

2

×（

2

3

+

4

5

）]．

Answer 1

（1）6.3×8.7+8.7×3.7
=（6.3+3.7）×8.7
=10×8.7
=87

（2）（

1

3

-

1

6

+

1

4

）×12
=

1

3

×12-

1

6

×12+

1

4

×12
=4-2+3
=5

（3）

7

4

×

5

8

+

1

4

÷

8

5

=

7

4

×

5

8

+

1

4

×

5

8

=（

7

4

+

1

4

）×

5

8

=2×

5

8

=

5

4

（4）3÷

3

7

-

3

7

÷3
=3×

7

3

-

3

7

×

1

3

=7-

1

7

=6

6

7

（5）

9

20

÷[

1

2

×（

2

3

+

4

5

）]
=

9

20

÷[

1

2

×

22

15

]
=

9

20

÷

11

15

=

9

20

×

15

11

=

27

44

．