(2012•龙岗区模拟)脱式计算.

1个回答

  • 解题思路:本题据四则混合运算的运算法则计算即可.

    (1)4050-6300÷42

    =4050-6300÷7÷6,

    =4050-150,

    =3900;

    (2)5.04×6.5-2.76

    =32.76-2.76,

    =30;

    (3)175×

    3

    10+

    7

    10×175

    =(

    3

    10+

    7

    10])×175,

    =1×175,

    =175;

    (5)13÷(

    1

    4+

    5

    6)×

    3

    4

    =13÷[13/12×

    1

    4],

    =12×[1/4],

    =3;

    (6)[8/15×[

    5

    6÷(

    7

    9−

    1

    3)]

    =

    8

    15]×([5/6÷

    4

    9]),

    =[8/15×

    45

    24],

    =1;

    点评:

    本题考点: 整数、分数、小数、百分数四则混合运算.

    考点点评: 完成本题要认真分析各组数据,看是否能进行简便计算.