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3. MS Excel, Mathcad MatLab:
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Microsoft Office Excel
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f(x) .
MathCad
Polyroots(v) - , v.
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polyroots:
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x , f=0 ( f ).
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MatLab
>> x = solve('(x^4)-x^3+x^2-11*x+10=0')
x =
- 2*i - 1
2*i - 1
>> P = [1,-1,1,-11,10]; >> disp(roots(P)) 2.0000 -1.0000 + 2.0000i -1.0000 - 2.0000i 1.0000 |
Microsoft Office Excel
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MathCad
Find(x,y,...) - .
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, Lsolve.
MatLab
>> A=[5 8 -1; 1 2 3; 2 -3 2];
>> B=[-7; 1; 9];
>> X=inv(A)*B
X =
1.2500
-1.5385
0.9423
>> A=[5 8 -1; 1 2 3; 2 -3 2]; >> B=[-7; 1; 9]; >> A1=[-7 8 -1; 1 2 3; 9 -3 2]; >> A2=[5 -7 -1; 1 1 3; 2 9 2]; >> A3=[5 8 -7; 1 2 1; 2 -3 9]; >> X=[det(A1)/det(A); det(A2)/det(A); det(A3)/det(A)] X = 1.2500 -1.5385 0.9423 |