Question

能简便的用简便方法计算．1+0.45÷0.9-782.5×25-0.12÷1

能简便的用简便方法计算．1+0.45÷0.9-782.5×25-0.12÷13+8.36(712+58?1136)×721.4+(38?0.25)÷11445×[(1.5+223)÷3.75?23]．

Answer 1

（1）1+0.45÷0.9-

7

8

=1+0.5-0.875
=1.5-0.875
=0.625

（2）2.5×

2

5

-0.12÷

1

3

+8.36
=1-0.12×3+8.36
=1-0.36+8.36
=0.64+8.36
=9

（3）（

7

12

+

5

8

-

11

36

）×72
=

7

12

×72+

5

8

×72-

11

36

×72
=42+45-22
=65

（4）1.4+（

3

8

-0.25）÷1

1

4

=1.4+（

3

8

-

1

4

）÷1

1

4

=1.4+

1

8

×

4

5

=1.4+

1

10

=1.4+0.1
=1.5

（5）45×[（1.5+2

2

3

）÷3.75-

2

3

]
=45×[（1

1

2

+2

2

3

）÷3

3

4

-

2

3

]
=45×[

25

6

×

4

15

-

2

3

]
=45×[

10

9

-

2

3

]
=45×

4

9

=20