Division in CAS

[Albert Chan]

[a b/c] key turning exact fraction to approximation may be a bug. (if exact mode is ON)

Number once turned approximate, may not be able to revert back to exact form.
exact() does not really mean "exact", only rationalize the approximated number

CAS> exact(approx(π))      → 4272943/1360120

Also, in CAS, approx numbers shown may not match what is internally stored.

CAS> approx(123456789123456789/127)      → 9.72100701759e14
CAS> Ans-9.72100701759e14                       → 492.

972100701759492 is stored as hex-float 0x1.ba0f6a81d4020p+49