简便计算:5.8+2.47+7.53

1个回答

  • 解题思路:(1)根据加法结合律简便计算;

    (2)根据减法的性质计算;

    (3)将47.23+72.29-27.23变形为47.23-27.23+72.29进行计算.

    (1)5.8+2.47+7.53

    =5.8+(2.47+7.53)

    =5.8+10

    =15.8;

    (2)81.52-60.25-0.75

    =81.52-(60.25+0.75)

    =81.52-61

    =20.52;

    (3)47.23+72.29-27.23

    =47.23-27.23+72.29

    =20+72.29

    =92.29.

    点评:

    本题考点: 运算定律与简便运算.

    考点点评: 考查了运算定律与简便运算,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简便计算.