简便运算①6.2×10.1②1.25×32×0.25③35.4×44.2-35.3×44.3.

1个回答

  • 解题思路:①把10.1看作10+0.1,运用乘法分配律简算;

    ②把32看作8×4,运用乘法结合律简算;

    ③运用乘法分配律简算.

    ①6.2×10.1,

    =6.2×(10+0.1),

    =62+0.62,

    =62.62;

    ②1.25×32×0.25,

    =1.25×8×4×0.25,

    =(1.25×8)×(4×0.25),

    =10×1,

    =10;

    ③35.4×44.2-35.3×44.3,

    =(35.4-35.3)×44.3,

    =0.1×44.3,

    =4.43.

    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: 完成本题要注意分析式中数据,运用合适的简便方法计算.