奥数2011-2001+1991-1981+1971-1961+···+51-41+31-21=?2011-2001+1991-1981+1971-1961+···+51-41+31-21= (2011 - 2001) + (1991 - 1981) + (1971 - 1961) + ... + (51 - 41) + (31 - 21) = 10 + 10 + 10 + ... + 10 + 10 = 10 *100 = 1000
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 22:02:43
![奥数2011-2001+1991-1981+1971-1961+···+51-41+31-21=?2011-2001+1991-1981+1971-1961+···+51-41+31-21= (2011 - 2001) + (1991 - 1981) + (1971 - 1961) + ... + (51 - 41) + (31 - 21) = 10 + 10 + 10 + ... + 10 + 10 = 10 *100 = 1000](/uploads/image/z/761030-62-0.jpg?t=%E5%A5%A5%E6%95%B02011-2001%2B1991-1981%2B1971-1961%2B%C2%B7%C2%B7%C2%B7%2B51-41%2B31-21%3D%3F2011-2001%2B1991-1981%2B1971-1961%2B%C2%B7%C2%B7%C2%B7%2B51-41%2B31-21%3D+%282011+-+2001%29+%2B+%281991+-+1981%29+%2B+%281971+-+1961%29+%2B+...+%2B+%2851+-+41%29+%2B+%2831+-+21%29+%3D+10+%2B+10+%2B+10+%2B+...+%2B+10+%2B+10+%3D+10+%2A100+%3D+1000)
奥数2011-2001+1991-1981+1971-1961+···+51-41+31-21=?2011-2001+1991-1981+1971-1961+···+51-41+31-21= (2011 - 2001) + (1991 - 1981) + (1971 - 1961) + ... + (51 - 41) + (31 - 21) = 10 + 10 + 10 + ... + 10 + 10 = 10 *100 = 1000
奥数2011-2001+1991-1981+1971-1961+···+51-41+31-21=?
2011-2001+1991-1981+1971-1961+···+51-41+31-21= (2011 - 2001) + (1991 - 1981) + (1971 - 1961) + ... + (51 - 41) + (31 - 21) = 10 + 10 + 10 + ... + 10 + 10 = 10 *100 = 1000
奥数2011-2001+1991-1981+1971-1961+···+51-41+31-21=?2011-2001+1991-1981+1971-1961+···+51-41+31-21= (2011 - 2001) + (1991 - 1981) + (1971 - 1961) + ... + (51 - 41) + (31 - 21) = 10 + 10 + 10 + ... + 10 + 10 = 10 *100 = 1000
2011-2001+1991-1981+1971-1961+···+51-41+31-21= (2011 - 2001) + (1991 - 1981) + (1971 - 1961) + ...+ (51 - 41) + (31 - 21) = 10 + 10 + 10 + ...+ 10 + 10 = 10 *[(2011-21)÷20+1] = 1000