However, how can CAS do infinite precision calculations in a limited precision calculator?
CAS gives 1 in both exact and aproximate answer modes, even when I "shift+Enter" the expression to calculate the aproximate answer first, so it doesn't seem to use the exact result as base for the aproximate one.
How does it achieve 1 then?
The CAS works with symbolic representations. If you run
exact(3.14) in CAS, you'll get a rational fraction.
(1/9)*9 simply uses simplification of fractions: the 9's cancel. When you run
approx((1/9)*9), the CAS first runs
(1/9)*9) to
1, which results in an expression
approx(1) which becomes approximate (if you stick it into another calculation, it will make the rest approx unless you say exact)
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Don't worry: I will get rid of the buttons and hook it up to my PC via the printer port. That way I can send files to the 8 bit computer.
