如题所述
|A+B|=|A1+A3,A2+A1,A3+2A2|
=|A1-2A2,A2+A1,A3+2A2|……c1-c3
=|3A1,A2+A1,A3+2A2|……c1+2c2
=3|A1,A2+A1,A3+2A2|
=3|A1,A2,A3+2A2|……c2-c1
=3|A1,A2,A3|……c3-2c2
=3|A|
=6
=|A1-2A2,A2+A1,A3+2A2|……c1-c3
=|3A1,A2+A1,A3+2A2|……c1+2c2
=3|A1,A2+A1,A3+2A2|
=3|A1,A2,A3+2A2|……c2-c1
=3|A1,A2,A3|……c3-2c2
=3|A|
=6
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第1个回答 2018-06-05
你自己不是都做出来了么?就那个思路继续啊