题目内容

【题目】怎样简便怎样算.

(1)16﹣5.32﹣4.68

(2)7.29×4.6+4.6×12.71

(3)3.4﹣0.15×2.6

(4)1.25×2.5×3.2

(5)40.4÷(0.5+7.5)

(6)[(8.1﹣5.6)×0.9﹣1]×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.

解答:解:(1)16﹣5.32﹣4.68

=16﹣(5.32+4.68)

=16﹣10

=6;

(2)7.29×4.6+4.6×12.71

=(7.29+12.71)×4.6

=20×4.6

=92;

(3)3.4﹣0.15×2.6

=3.4﹣0.39

=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)[(8.1﹣5.6)×0.9﹣1]×0.4

=[2.5×0.9﹣1]×0.4

=[2.25﹣1]×0.4

=1.25×0.4

=0.5.

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