题目内容

【题目】怎样简便怎样算

1. 165.324.68

2. 7.29×4.6+4.6×12.71

3. 3.40.15×2.6

4. 1.25×2.5×3.2

5. 40.4÷(0.5+7.5)

6. [(8.15.6)×0.91]×0.4.

【答案】6;92;3.01;10;5.05;0.5

【解析】

试题分析:(1)根据减法的性质进行简算;

(2)根据乘法分配律进行简算;

(3)先算乘法,再算减法;

(4)根据乘法交换律和结合律进行简算;

(5)先算加法,再算除法;

(6)先算小括号里面的减法,再算中括号里面的乘法,再算中括号里面的减法,最后算括号外面的乘法

解:1. 165.324.68

=16(5.32+4.68)

=1610

=6

2. 7.29×4.6+4.6×12.71

=(7.29+12.71)×4.6

=20×4.6

=92

3. 3.40.15×2.6

=3.40.39

=3.01

4. 1.25×2.5×3.2

=1.25×2.5×(4×0.8)

=(1.25×0.8)×(2.5×4)

=1×10

=10

5. 40.4÷(0.5+7.5)

=40.4÷8

=5.05

6. [(8.15.6)×0.91]×0.4

=[2.5×0.91]×0.4

=[2.251]×0.4

=1.25×0.4

=0.5

练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网