If there is  an equation or are several equations, I need to obtain all the roots, how can I do???

fsolve ? rootfindings? or what?

If an examples of actual is given,  That will be perfect  !!!

Thanks 

Hello, everyone.

There are two variables: n1 and n2, how to define n1+n2=1 (not n1:=1-n2).

Thanks!!

In recent days, I have studied ExcelTools[Export]. Unfortunately, I still can not apply it.

oh, how??

Dear, can you provide an example?

Thanks!

underline is a simple procedure:
> s := solve({5*A+3*B = 5, 8*A-9*B = 94}, [A, B]);
s := [[A = 109/23, B = -430/69]]
> assign(s);
> A; B;
109/23
-430/69

But, now what I want to use is not 109/23 or -430/69, but A or B.
That is to say, firstly, I need use root of equation, so Execute Command
> assign(s);
> A; B;
then, I can apply 109/23 or -430/69. Then later on, I want to use A or B, which now are viewed asariable? Now how can I do?

Hello.
A simple procedure:
> restart;
> A := Array([1, 2, 3,4,5,6])
> for i from 1 to 6 do
   B[i]:=2*A[i];
    od;
This procedure is runed, the results are
B[1] := 2
B[2] := 4
B[3] := 6
B[4] := 8
B[5] := 10
B[6] := 12

However, what I want is:
If A is saved in a arbitrary folder, for example c:\myp\*.txt(or excel,dat), how can I read these data?
Then, if I want last results to be saved in a folder, for example c:\myp\*.txt...