早教吧 育儿知识 作业答案 考试题库 百科 知识分享

用简便方法计算.14.15+5.87+5.858.07-5.8+0.9328.93-7.46-5.546.38+5.4+4.6+3.6212.6-3.28+7.4-5.7215.047+8.92-5.04780-(8.24-6.3+1.76)27.62-(7.62+4.85)

题目详情
用简便方法计算.
14.15+5.87+5.85           8.07-5.8+0.9328.93-7.46-5.54           
6.38+5.4+4.6+3.6212.6-3.28+7.4-5.72       15.047+8.92-5.047
80-(8.24-6.3+1.76)27.62-(7.62+4.85)
▼优质解答
答案和解析
(1)14.15+5.87+5.85
=(14.15+5.85)+5.87
=20+5.87
=25.87

(2)8.07-5.8+0.93
=(8.07+0.93)-5.8
=9-5.8
=3.2

(3)28.93-7.46-5.54           
=28.93-(7.46+5.54)
=28.93-13
=15.93

(4)6.38+5.4+4.6+3.62
=(6.38+3.62)+(5.4+4.6)
=10+10
=20

(5)12.6-3.28+7.4-5.72
=(12.6+7.4)-(3.28+5.72)
=20-9
=11

(6)15.047+8.92-5.047
=(15.047-5.047)+8.92    
=10+8.92
=18.92

(7)80-(8.24-6.3+1.76)
=80-[(8.24+1.76)-6.3]
=80-[10-6.3]
=80-3.7
=76.3

(8)27.62-(7.62+4.85)
=27.62-7.62-4.85
=20-4.85
=15.15