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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