Update 704-math-abs.markdown

Joe7M · web-flow · commit 3f62f8198336 · 2022-10-14T15:33:35.000+02:00
diff --git a/_build/reference/704-math-abs.markdown b/_build/reference/704-math-abs.markdown
@@ -4,4 +4,10 @@
 
 Returns the absolute value of x.
 
+```
+a =  1
+b = -1
 
+print abs(a)
+print abs(b)
+```
