 
 
 
10.1.2  Computing with units
Xcas performs usual arithmetic operations (+, -, *, /, ^) on
unit objects. Different units may be used, but they must be 
compatible for + and -. The result is an unit object
- 
for the 
multiplication and the division of two unit objects 
_u1 and _u2 the unit of the result is written 
_(u1*u2) or _(u1/u2). 
- for an addition or a subtraction of compatible unit objects, 
the result is expressed with the same unit as the first term of the operation.
Input :
1_m+100_cm
Output :
2_m
Input :
100_cm+1_m
Output :
200_cm
Input :
1_m*100_cm
Output :
1_m^2
 
 
