(2011•昆明模拟) 计算.8.8-[7/9]-(0.8+[7/9]) [4/29]×〔1-([3/4]-[3/8])

1个回答

  • 解题思路:运用整数、分数、小数和百分数的四则混合运算进行解答,计算时合理利用运算定律进行简算.

    8.8-[7/9]-(0.8+[7/9]),

    =8.8-[7/9]-0.8-[7/9],

    =(8.8-0.8)-[7/9]×2,

    =8-[14/9],

    =6

    4

    9;

    [4/29]×〔1-([3/4]-[3/8])〕,

    =[4/29]×〔1-[3/8]〕,

    =[4/29]×[5/8],

    =[5/58];

    [3/4]×7.8-0.75×2.8-75%,

    =(7.8-2.8-1)×0.75,

    =4×0.75,

    =3;

    111×28+999×8,

    =111×28+111×72,

    =111×(28+72),

    =111×100,

    =11100,;

    [7/9]×8.9+[7/9]×10%,

    =[7/9]×(8.9+0.1),

    =[7/9]×9,

    =7;

    2[3/4]+1[5/9]+2.25+3[4/9],

    =(2.75+2.25)+(1

    5

    9+3

    4

    9),

    =5+5,

    =10.

    点评:

    本题考点: 运算定律与简便运算;分数的四则混合运算;整数、分数、小数、百分数四则混合运算.

    考点点评: 本题主要考查分数小数百分数的四则混合运算,计算时注意应用运算定律进行简算.