
[理工] 線代 零核空間

想請問一下這題b選項的null(A)為什麼也會是x1,x2的展延呢?
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02/01 12:48, , 1F
02/01 12:48, 1F
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02/01 12:49, , 2F
02/01 12:49, 2F
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02/01 12:50, , 3F
02/01 12:50, 3F
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02/01 12:51, , 4F
02/01 12:51, 4F
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02/01 12:51, , 5F
02/01 12:51, 5F
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02/01 12:51, , 6F
02/01 12:51, 6F
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02/01 12:52, , 7F
02/01 12:52, 7F
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02/01 12:52, , 8F
02/01 12:52, 8F
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02/01 12:53, , 9F
02/01 12:53, 9F