问题描述:
计算题 简算
(-1/2)*2/3*(-3/4)*4/5*(-5/6)*······*(-19/20)
(-1/2)-1/6-1/12-1/20-······-1/90
(-1/2)*2/3*(-3/4)*4/5*(-5/6)*······*(-19/20)
(-1/2)-1/6-1/12-1/20-······-1/90
问题解答:
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