Question

0.81+15.3=	1300-497=	3-1/2=	3/4+0.72=
1÷0.04=	1/8÷0.625=	4.5×4/15=	1 105 ： 1 5 = 1 21
1.5+2/3×3=	1-1/3×2/5=	1.25×0.36×8=	1÷（2-2.09）=

Answer 1

分析：本題可按照運(yùn)算法則直接運(yùn)算．

解答：解：0.81+15.3=16.11        1300-497=803                     3-

1

2

=2

1

2

                

3

4

+0.72=1.47
1÷0.04=25                 

1

8

÷0.625=

1

5

                     4.5×

4

15

=

6

5

             

1

105

：

1

5

=

1

21

1.5+

2

3

×3=3.5              1-

1

3

×

2

5

=

13

15

                     1.25×0.36×8=3.6      1÷（2.09-2）=

100

9

點(diǎn)評：本題用運(yùn)算法則直接運(yùn)算，要看清楚數(shù)字和運(yùn)算符號．有小數(shù)和分?jǐn)?shù)時(shí)，看清化成那個(gè)更簡單，看是否可用簡算．