设D= (1)计算D; (2)求M31+M33+M34.

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问题 设D=
    (1)计算D;
    (2)求M31+M33+M34

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答案[*] (2)M31+M33+M34=1×A31+0×A32+1×A33+(-1)×A34 [*]

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