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4.??????(???3??????)

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a)?????????12??????????????????

b)???????????????????????

c)????????20????????5000??????

d)????????10????????3000????

e)?????????5????????1000????

f???????λ??5????????500????

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a)?????????12???????????

b)?????????????????????????

c)??????????????в??????????????50??????

d)???????1000,2000,2500????????3??5????10????????