计算.(能简算的要用简便方法计算.) 5 12 × 7 25 × 3 14 7 9 ÷ 1 2 ÷ 35 36 1 14

1个回答

  • (1)

    5

    12 ×

    7

    25 ×

    3

    14 ,

    =

    7

    60 ×

    3

    14 ,

    =

    1

    40 ;

    (2)

    7

    9 ÷

    1

    2 ÷

    35

    36 ,

    =

    14

    9 ×

    36

    35 ,

    =

    8

    5 ;

    (3)

    1

    14 ×(

    7

    8 +7),

    =

    1

    14 ×

    7

    8 +7×

    1

    14 ,

    =

    1

    16 +

    1

    2 ,

    =

    9

    16 ;

    (4)

    3

    5 ×

    8

    9 ÷

    5

    8 ,

    =

    8

    15 ×

    8

    5 ,

    =

    64

    75 ;

    (5)

    5

    6 ×

    1

    4 +

    5

    6 ×

    3

    4 ,

    =

    5

    6 ×(

    1

    4 +

    3

    4 ),

    =

    5

    6 ×1,

    =

    5

    6 ;

    (6)96×

    4

    5 -36÷

    5

    4 +

    4

    5 ×40,

    =96×

    4

    5 -36×

    4

    5 +

    4

    5 ×40,

    =(96-36+40)×

    4

    5 ,

    =100×

    4

    5 ,

    =80;

    (7)

    4

    9 ÷[(

    1

    3 -

    1

    9 )×2],

    =

    4

    9 ÷[

    2

    9 ×2],

    =

    4

    9 ÷

    4

    9 ,

    =1;

    (8)

    3

    4 +

    7

    9 +

    1

    4 -

    4

    9 ,

    =(

    3

    4 +

    1

    4 )+(

    7

    9 -

    4

    9 ),

    =1+

    1

    3 ,

    =1

    1

    3 ;

    (9)

    2

    7 ×

    5

    9 ÷

    2

    7 ×

    5

    9 ,

    =

    2

    7 ×

    5

    9 ×

    7

    2 ×

    5

    9 ,

    =(

    2

    7 ×

    7

    2 )×(

    5

    9 ×

    5

    9 ),

    =1×

    25

    81 ,

    =

    25

    81 ;

    (10)(

    11

    12 -

    3

    7 )-(

    4

    7 -

    7

    12 ),

    =

    11

    12 -

    3

    7 -

    4

    7 +

    7

    12 ,

    =(

    11

    12 +

    7

    12 )-(

    3

    7 +

    4

    7 ),

    =

    3

    2 -1,

    =

    1

    2 ;

    (11)

    3

    5 ×0.25+

    3

    5 ×

    3

    4 ,

    =

    3

    5 ×(0.25+

    3

    4 ),

    =

    3

    5 ×1,

    =

    3

    5 .