怎样简便怎样计算. 2 9 × 5 11 ×27×33 2 7 ×(1÷ 3 4 - 3 4 ÷1) 2006× 200

1个回答

  • (1)

    2

    9 ×

    5

    11 ×27×33,

    =(

    2

    9 ×27)×(

    5

    11 ×33),

    =6×15,

    =90;

    (2)

    2

    7 ×(1÷

    3

    4 -

    3

    4 ÷1),

    =

    2

    7 ×(

    4

    3 -

    3

    4 ),

    =

    2

    7 ×

    7

    12 ,

    =

    1

    6 ;

    (3)2006×

    2004

    2005 ,

    =(2005+1)×

    2004

    2005 ,

    =2005×

    2004

    2005 +1×

    2004

    2005 ,

    =2004+

    2004

    2005 ,

    =2004

    2004

    2005 ,

    (4) 3

    3

    4 ×2.6+ 1

    2

    5 ×3.75,

    =3.75×2.6+1.4×3.75,

    =3.75×(2.6+1.4),

    =3.75×4,

    =15;

    (5)

    19

    43 ×34+53×

    19

    43 -

    19

    43 ,

    =

    19

    43 ×(34+53-1),

    =

    19

    43 ×86,

    =38;

    (6)

    5

    6 ×

    1

    10 + 1

    1

    2 ×0.1+ 2

    2

    3 ÷10,

    =

    5

    6 ×

    1

    10 + 1

    1

    2 ×

    1

    10 + 2

    2

    3 ×

    1

    10 ,

    =(

    5

    6 + 1

    1

    2 + 2

    2

    3 )×

    1

    10 ,

    =5×

    1

    10 ,

    =

    1

    2 .