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i是虚数单位,i+2i2+3i3+…+8i8= .(用a+bi的形式表示,a,b...
i是虚数单位,i+2i2+3i3+…+8i8= .(用a+bi的形式表示,a,b∈R)
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,则S
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数列1,
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C.
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D.
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在等差数列{a
n}中,a
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