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(1988+1986+1984+……+4+2)-(1+3+……+1985+1987) =(2-1)+(4-3)+(6-5)+.+(1986-1985)+(1988-1987)共計1988/2=994組 =1+1+1+1+.+1 =1*994 =994 不懂請問.
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