90个埃及数有90个埃及数1/2,1/3,...,1/90,1/91,从中挑九个,加上正负号,使之等-1!(看清!是挑九个!和等于—1!
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![90个埃及数有90个埃及数1/2,1/3,...,1/90,1/91,从中挑九个,加上正负号,使之等-1!(看清!是挑九个!和等于—1!](/uploads/image/z/1667352-48-2.jpg?t=90%E4%B8%AA%E5%9F%83%E5%8F%8A%E6%95%B0%E6%9C%8990%E4%B8%AA%E5%9F%83%E5%8F%8A%E6%95%B01%EF%BC%8F2%2C1%EF%BC%8F3%2C%EF%BC%8E%EF%BC%8E%EF%BC%8E%2C1%EF%BC%8F90%2C1%EF%BC%8F91%2C%E4%BB%8E%E4%B8%AD%E6%8C%91%E4%B9%9D%E4%B8%AA%2C%E5%8A%A0%E4%B8%8A%E6%AD%A3%E8%B4%9F%E5%8F%B7%2C%E4%BD%BF%E4%B9%8B%E7%AD%89%EF%BC%8D1%21%EF%BC%88%E7%9C%8B%E6%B8%85%21%E6%98%AF%E6%8C%91%E4%B9%9D%E4%B8%AA%21%E5%92%8C%E7%AD%89%E4%BA%8E%E2%80%941%21)
90个埃及数有90个埃及数1/2,1/3,...,1/90,1/91,从中挑九个,加上正负号,使之等-1!(看清!是挑九个!和等于—1!
90个埃及数有90个埃及数1/2,1/3,...,1/90,1/91,从中挑九个,加上正负号,使之等-1!
(看清!是挑九个!和等于—1!
90个埃及数有90个埃及数1/2,1/3,...,1/90,1/91,从中挑九个,加上正负号,使之等-1!(看清!是挑九个!和等于—1!
-1/2-1/3-1/5-1/6+1/10+1/15+1/20-1/30+1/60=-1