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Mathematical matrix of senior two, why does the same y calculate two different values? Is the topic wrong or something wrong?
You did the right thing in question 10. Two y values indicate that there is no such y, that is, it does not exist.
You can understand the eighth question like this. The given formula is expanded into a third-order determinant. Just looking at it from another angle, it is from left to right or from right to left. (Pay attention to the symbols, of course)