1又十分之一加上3又四十分之一加上5又八十八分之一加上7又一百五十四分之一加上9又二百三十八分之一
=(1+1/10)+(3+1/40)+(5+1/88)+(7+1/154)+(9+1/238)
=1+1/10+3+1/40+5+1/88+7+1/154+9+1/238
=1+3+5+7+9+1/10+1/40+1/88+1/154+1/238
=25+(3/10+3/40+3/88+3/154+3/238)/3
=25+[(1/2-1/5)+(1/5-1/8)+(1/8-1/11)+(1/11-1/14)+(1/14-1/17)]/3
=25+(1/2-1/5+1/5-1/8+1/8-1/11+1/11-1/14+1/14-1/17)/3
=25+(1/2-1/17)/3
=25+(17/34-2/34)/3
=25+(15/34)/3
=25+5/34