Solve a system of two or three linear equations with Cramer’s rule or elimination, showing the unknowns for algebra and engineering work.
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Cramer's rule | xᵢ = det(Aᵢ)/det(A) (det(A)≠0) | Cramer 1750; linear algebra |
| Gaussian elim. | row reduction to upper triangular | Numerical linear algebra |
线性方程组求解(2元/3元)。科学研究工具,采用标准科学公式,计算精准。