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20 10 Jiangsu college entrance examination mathematics examination paper No.65438 +05 answer
(1) Vector AB = (3 3,5) AC = (-1,1), then

AB+AC=(2，6)？ AB-AC=(4，4)

So what? The radical sign of |AB+AC|=2 10|AB-AC|=4.

So what are the lengths of the two diagonals? 2 root number 10? ,? 4 root number 2

(2)

There is a detailed explanation here.

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