题目内容

用递等式计算.
(1)0.48+10.8÷0.36×0.54

(2)[9.08-(0.61+1.75)]+3.2
(3)数学公式(4)数学公式

解:(1)0.48+10.8÷0.36×0.54,
=0.48+30×0.54,
=0.48+16.2,
=16.68;

(2)[9.08-(0.61+1.75)]+3.2,
=[9.08-2.36]+3.2,
=6.72+3.2,
=9.92;

(3)-÷+
=-×+
=-+
=+
=

(4)÷[(-)÷],
=÷[÷],
=÷[×],
=÷
=×
=6.
分析:(1)先算除法和乘法,再算加法;
(2)(4)先算小括号内的,再算中括号内的,最后算括号外的;
(3)先算除法,再算减法和加法.
点评:用递等式计算,特别注意运算顺序和运算法则.
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