+0  
 
0
324
1
avatar

3xy-3xy=?

Guest Apr 24, 2017
 #1
avatar+92781 
+3

3xy-3xy   =   

 

x*y = y*x

 

so

3xy = 3yx

 

so

3xy-3xy= 0

Melody  Apr 24, 2017

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