用简便方法计算(1)3.7×99+3.7

1个回答

  • 解题思路:(1)根据乘法分配律简算;

    (2)根据加法交换律和结合律简算;

    (3)根据减法的性质简算;

    (4)根据乘法分配律简算.

    (1)3.7×99+3.7

    =3.7×(99+1)

    =3.7×100

    =370;

    (2)5.93+0.64+0.07+0.36

    =(5.93+0.07)+(0.64+0.36)

    =6+1

    =7;

    (3)5.37-1.47-2.53

    =5.37-(1.47+2.53)

    =5.37-4

    =1.37;

    (4)105×([1/3]+[1/5])

    =105×[1/3]+105×[1/5]

    =35+21

    =56.

    点评:

    本题考点: 分数的简便计算;运算定律与简便运算.

    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.