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1.正、负数分别算例4所有个位数与十位数都是奇数的两 例1计算位数的和是1一2+3一4+…1993一1994+1995-.解设其和为S,则 解原式一(l十3+5+“·1993+1995)5一n+13+…+19+31+33+…+匀9+ 一(2+4十6+…十1992十1994)51十55+…十59十71.十73·十…十79十 井书丝旦又998一丝量丝兰·9
1. The positive and negative numbers of Example 4 are all odd and single digits. The sum of the number of 1 and the number of calculations is 1 - 2 + 3 - 4 +... 1993 - 1994 + 1995 -. For S, then solve the original one (l ten 3 + 5 + "1993 + 1995) 5 a n + 13 + ... + 19 +31 +33 + ... + 9 + 1 (2+4 ten 6 + ... ten 1992 ten 1994) 51 ten 55+... ten 59 ten seventy-one seventy-three ten ten...