625加2.625加3.625加4.625加5.625.加10.625等于
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![625加2.625加3.625加4.625加5.625.加10.625等于](/uploads/image/z/10157033-65-3.jpg?t=625%E5%8A%A02.625%E5%8A%A03.625%E5%8A%A04.625%E5%8A%A05.625.%E5%8A%A010.625%E7%AD%89%E4%BA%8E)
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625加2.625加3.625加4.625加5.625.加10.625等于
625加2.625加3.625加4.625加5.625.加10.625等于
625加2.625加3.625加4.625加5.625.加10.625等于
由0.625=5/8得
625+2.625+3.625+4.625+5.625+...+10.625
=625+(1+1+1+1+1+1+1+1+1)*(5/8)+(2+10)*9/2
=625+45/8+54=625+5.625+54=684.625
若是1.625+2.625+3.625+4.625+5.625+...+10.625
=(1+10)*10/2+10*0.625=55+6.25=61.25