简便计算(要求写出简算过程). 73÷36+105÷36+146÷36 11+12+13+14+15+16+17+18+

1个回答

  • 解题思路:(1)根据除法的性质简算;

    (2)运用加法交换律、结合律简算;

    (3)运用乘法交换律、结合律简算;

    (4)根据加法结合律和减法的性质简算.

    (1)73÷36+105÷36+146÷36,

    =(73+105+146)÷36,

    =324÷36,

    =9;

    (2)11+12+13+14+15+16+17+18+19,

    =(11+19)+(12+18)+(13+17)+(14+16)+15,

    =30+30+30+30+15,

    =30×4+15,

    =120+15,

    =135;

    (3)25×125×8×4,

    =(25×4)×(125×8),

    =100×1000,

    =100000;

    (4)154-283+246-117,

    =(154+246)-(283+117),

    =400-400,

    =0.

    点评:

    本题考点: 运算定律与简便运算;整数四则混合运算.

    考点点评: 本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.