...correct, but (A^T)A is wrong, the (1,1) entry should be 1 instead of -1. A^n only exist when A is a square matrix.
...(30) = 90000 2011-03-13 21:32:42 補充： (2)(a) should be P'(9) instead of P'(6)
... by (31 mod 10)^2just want to copy and paste the whole expression to the calculator, instead of simplifying (which may introduce typing error...ok... i admit i am...
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