Question

直接写出下面各题的得数．

15+8=	0.5+0.4=	4-0.9=	7 9 - 2 9 =
1 6 × 6 7 =	4÷0.8=	0÷ 4 9 =	24×13=
1- 3 4 =	0.45×1000=	9÷ 1 5 =	8.7-7=
786-298=	3.14×8=	2 5 ÷ 1 2 =	4 5 + 4 5 =
100×1%=	25×0.7×4=	2-2÷3=	（ 3 8 -0.375）×5=

Answer 1

分析：本题直接根据四则运算法则进行运算．

解答：解：15+8=23             0.5+0.4=0.9                      4-0.9=3.1                 

7

9

-

2

9

=

5

9

1

6

×

6

7

=

1

7

              4÷0.8=5                        0÷

4

9

=0                    24×13=312
1-

3

4

=

1

4

                 0.45×1000=450                   9÷

1

5

=45                   8.7-7=1.7
786-298=488             3.14×8=25.12                  

2

5

÷

1

2

=

4

5

                  

4

5

+

4

5

=

8

5

100×1%=1              25×0.7×4=70                    2-2÷3=

4

3

                  （

3

8

-0.375）×5=0

点评：本题用运算法则直接运算，要看清楚数字和运算符号．