第7题怎么做啊
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你看看这样对不对：
|a1+2a2, 3a1+2a3, 5a2| = 5|a1+2a2, 3a1+2a3, a2|
=-5|a1+2a2, a2, 3a1+2a3|
=-5|a1, a2, 3a1+2a3|
=-5|a1, a2, 2a3|
=-10|a1, a2, a3|
=-10*5 = -50
|a1+2a2, 3a1+2a3, 5a2| = 5|a1+2a2, 3a1+2a3, a2|
=-5|a1+2a2, a2, 3a1+2a3|
=-5|a1, a2, 3a1+2a3|
=-5|a1, a2, 2a3|
=-10|a1, a2, a3|
=-10*5 = -50
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