设,求:(1)2A11+A12一A13;(2)A11+4A21+A31+2A41

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问题,求:(1)2A11+A12一A13;(2)A11+4A21+A31+2A41

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答案2A11+A12一A13=2A11+A12一A13+0A14 [*]

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