计算下面各题,能简便计算的用简便方法计算.

1个回答

  • 解题思路:利用乘法分配律、加法结合律、加分交换律得等进行解决问题.

    7.4×9.8-14.5,

    =7.4×(10-0.2)-14.5,

    =7.4×10-7.4×0.2-14.5,

    =74-1.48-14.5,

    =58.02;

    13.4+5.62+17.6+4.38,

    =(13.4+17.6)+(5.62+4.38),

    =31+10,

    =41;

    6.73×4.8+5.2×6.73,

    =6.73×(4.8+5.2),

    =6.73×10,

    =67.3;

    8.4÷0.6+8.4÷0.4,

    =84÷6+84÷4

    =14+21

    =35;

    (9.6+1.48÷3.7)÷8,

    =9.6÷8+1.48÷3.7÷8,

    =1.2+0.05,

    =1.25; 5.8÷[4×(1.34-0.14)],

    =5.8÷(4×1.2),

    =5.8÷4.8,

    =1.2.

    点评:

    本题考点: 运算定律与简便运算;小数四则混合运算.

    考点点评: 耐心细致的计算,按部就班的解决问题,是解决运算定律和小数四则运算关键.