Answered

Sumali sa IDNStudy.com at makakuha ng maraming kaalaman. Makakuha ng impormasyon mula sa aming mga eksperto, na nagbibigay ng detalyadong sagot sa lahat ng iyong mga tanong.

How to prove the following using the Order properties of Real Numbers?
1.If a,b element of Real number and a<b,then a<a+b/2<b.
2.If a<b and c<d,then ad+bc < ac+bd.



Sagot :

set examples. 
1. a<b , a<a+b/2<b 
   = a<a+b/2                                              = a+b/2<b 
   = 2a < 2a + b                                         = 2a +b <b
   = 2a -2a <b                                            = 2a<0
   = 0 < b                                             
which doesnt prove anything. so lets set examples. 
say for example a= -5 , b= -4 
-5<-5+-2<-4
-5<-7<-4  ,   -5 is not less than -7 it is more than -7 
hence, <b , a<a+b/2<b is not always true. 

2. a<b and c<d then ad+bc < ac+bd 
   = ad-ac<bd-bc
   = a(d-c)<b(d-c) 
   = a < b which is stated in the above statement.