计算下面各题(能简算的要简算). 17×25×8 73×18+82×73 6756-193-207 183-25-75+

1个回答

  • 解题思路:(1)把8看作4×2,运用乘法交换律与结合律简算;

    (2)(6)运用乘法分配律简算;

    (3)运用减法的性质简算;

    (4)运用加法交换律以及减法的性质简算;

    (5)把101看作100+1,运用乘法分配律简算.

    (1)17×25×8,

    =17×25×4×2,

    =17×2×(25×4),

    =34×100,

    =3400;

    (2)73×18+82×73,

    =73×(18+82),

    =73×100,

    =7300;

    (3)6756-193-207,

    =6756-(193+207),

    =6756-400,

    =6356;

    (4)183-25-75+117,

    =183+117-(25+75),

    =300-100,

    =200;

    (5)64×101,

    =64×(100+1),

    =6400+64,

    =6464;

    (6)326×124-326×24,

    =326×(124-24),

    =326×100,

    =32600.

    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: 完成本题要注意分析式中数据,运用合适的简便方法计算.