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.