计算下面各题.38.6+1.28+1.46 5.7-1.26-3.04 17.8+0.42-4.81 15,4-0.82

1个回答

  • 解题思路:(1)可以先算1.28+1.46=2.74,再算38.6+274;

    (2)可以运用减法的性质简算;

    (3)(4)从左往右依次运算;

    (5)(6)先算括号内的,再算括号外的.

    (1)38.6+1.28+1.46,

    =38.6+(1.28+1.46),

    =38.6+2.74,

    =41.34;

    (2)5.7-1.26-3.04,

    =5.7-(1.26+3.04),

    =5.7-4.3,

    =1.4;

    (3)17.8+0.42-4.81,

    =18.2-4.81,

    =13.41;

    (4)15.4-0.82+1.67,

    =14.58+1.67,

    =16.25;

    (5)8.65-(3.56+1.8),

    =8.65-5.36,

    =3.29;

    (6)6.5+(12.08+4.36),

    =6.5+16.44,

    =22.94.

    点评:

    本题考点: 小数四则混合运算.

    考点点评: 完成此题,注意运算顺序以及运算法则.