Math M2 ^(20pts)

回答 (1)

知識就是力量

2011-12-31 6:44 am

✔ 最佳答案

(a) Expand the det, simply and get the ans, then use cramer's rule to solve (E)
(b)(i) Gaussian's elimination, put z = t, solved
put the solutions into L.H.S. = 2y^2 - x^2 - z, to see if it is equal to 16.
(c) Guassian's elimination again.

2011-12-30 22:44:25 補充：
As follows:

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參考: Knowledge is power.

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