Question

轻松一刻（直接写出得数）． 40× 5 8 =	2 5 ÷ 2 5 =	10÷ 1 10 =
5 6 - 1 2 =	7 8 × 6 11 × 8 7 =	4 9 ÷ 2 3 =
2 3 ÷2=	3 20 × 1 20 =	1-40%=
1÷ 1 10 ×1÷ 1 10 =

Answer 1

分析：运用分数乘除法及加减法法则，相乘时分子乘分子的积作分子，分母乘分母的积作分母，分子和分母能约分时要先约分再计算，除以一个分数等于乘这个分数的倒数．

解答：解：40×

5

8

=25           

2

5

÷

2

5

=1                    10÷

1

10

=100
   

5

6

-

1

2

=

1

3

            

7

8

×

6

11

×

8

7

=

6

11

               

4

9

÷

2

3

=

2

3

   

2

3

÷2=

1

3

            

3

20

×

1

20

=

3

400

                1-40%=0.6
    1÷

1

10

×1÷

1

10

=100

点评：熟练记住法则，掌握运算顺序，多做多练是关键．