Question

（2010?江蘇模擬）直接寫(xiě)得數(shù)
2.2+3.57=

3

4

×12=

1

9

+

2

3

=0.37+66.3=

5

8

÷

2

3

=3.25×4=

5

4

×8+8×

1

4

=

3

4

÷3×

3

4

÷3=

Answer 1

分析：根據(jù)：①小數(shù)加減法計(jì)算法則，先把小數(shù)點(diǎn)對(duì)齊（也就是把相同的數(shù)位上的數(shù)對(duì)齊），再按照整數(shù)加減法則進(jìn)行計(jì)算，最后在得數(shù)里對(duì)齊橫線(xiàn)上的小數(shù)點(diǎn)位置，點(diǎn)上小數(shù)點(diǎn)．②分?jǐn)?shù)乘以分?jǐn)?shù)的計(jì)算法則分?jǐn)?shù)乘以分?jǐn)?shù)，用分子相乘的積作分子，分母相乘的積作分母，③一個(gè)數(shù)除以分?jǐn)?shù)的計(jì)算法則一個(gè)數(shù)除以分?jǐn)?shù)，等于這個(gè)數(shù)乘以除數(shù)的倒數(shù)．

解答：解：2.2+3.57=5.77   

3

4

×12=9        

1

9

+

2

3

=

7

9

             0.37+66.3=66.67
  

5

8

÷

2

3

=

15

16

        3.25×4=13      

5

4

×8+8×

1

4

=12       

3

4

÷3×

3

4

÷3=

1

16

點(diǎn)評(píng)：此題考查的是小數(shù)計(jì)算法則和分?jǐn)?shù)的計(jì)算法則在實(shí)際中的應(yīng)用．