计算下面各题,能简算的要简算.48×( 5 6 + 5 8 - 5 12 )1.25×3.2×0.257-7× 3 7

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_Nanjolno_
_Nanjolno_ 2023-03-18 21:47
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  • 2023-03-18 22:11

    计算下面各题,能简算的要简算.48×( 5 6 + 5 8 - 5 12 )1.25×3.2×0.257-7× 3 7 + 4 7 35×(1- 3 7 )÷ 5 12 8 17 ÷19+ 1 19 × 9 17 2 3 + 1 3 × 3 4 .

    (1)48×(

    5

    6 +

    5

    8 -

    5

    12 ),

    =48×

    5

    6 +48×

    5

    8 -48×

    5

    12 ,

    =40+30-20,

    =50;

    (2)1.25×3.2×0.25,

    =1.25×0.8×(4×0.25),

    =1×1,

    =1;

    (3)7-7×

    3

    7 +

    4

    7 ,

    =7-3+

    4

    7 ,

    =4+

    4

    7 ,

    =4

    4

    7 ;

    (4)35×(1-

    3

    7 )÷

    5

    12 ,

    =35×

    4

    7 ×

    12

    5 ,

    =48;

    (5)

    8

    17 ÷19+

    1

    19 ×

    9

    17 ,

    =

    8

    17

    1

    19 +

    1

    19 ×

    9

    17 ,

    =(

    8

    17 +

    9

    17 )×

    1

    19 ,

    =

    1

    19 ;

    (6)

    2

    3 +

    1

    3 ×

    3

    4 ,

    =

    2

    3 +

    1

    4 ,

    =

    11

    12 .

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