(-2)60+(-2)59+(-2)58……+(-2)2+(-2)1+1
(-2)60+(-2)59+(-2)58……+(-2)2+(-2)1+1
60^2-59^2+58^2-57^2+…+2^2-1^2
(1+1/2+1/3+……+1/60)+(2/3+2/4+……+3/60)+……+(58/59+58/60)+1/60
(1/2+1/3+1/4+……+1/60)+(2/3+2/4+2/5+……+2/60)+……+(58/59+58/60)
1/2+(1/3+2/3)+(1/4+2/4+3/4)+…+(1/60+2/60+…58/60+59/60)简便算法
计算1+2-3+4+5-6+7+8-9…+58+59-60.
(1/2+1/3+1/4+…+1/59+1/60)+(2/3+2/4+2/5+…+2/59+2/60)+(3/4+3/5
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10+10/11+……+58/59+59/60怎么算
1/2+1/3+2/3+1/4+2/4+3/4+1/5+……+1/60+2/60+……+59/60
(1/2+1/3+1/4+.+1/60)+(2/3+2/4+2/5+.+2/60)+.+(58/59+58/60)+59
1\2+(1\3+2\3)+(1\4+4\2+4\3)+.(1\60+2\60+.+58\60+59\60)
1+2-3+4+5-6+7+.+58+59-60