1/2+5/6+11/12+19/20+.+89/90+109/110 答案是多少,还有要写明这里有几项?
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1/2+5/6+11/12+19/20+.+89/90+109/110 答案是多少,还有要写明这里有几项?
1/2+5/6+11/12+19/20+.+89/90+109/110 答案是多少,还有要写明这里有几项?
1/2+5/6+11/12+19/20+.+89/90+109/110 答案是多少,还有要写明这里有几项?
1/2+5/6+11/12+19/20+.+89/90+109/110
=1-1/2+1-1/6+1/1/12+1-1/20+……+1-1/90+1-1/110
=10-(1/2+1/6+1/12+1/20+……+1/90+1/110)
=10-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/9-1/10+1/10-1/11)
=10-(1-1/11)
=9+1/11
=9又1/11
1/2+5/6+11/12+19/20+...+9898/9900
1/2+5/6+11/12+19/20如何解
1/2+5/6+11/12+19/20+20/30怎么做,
1+1/2+5/6+11/12+19/20+……+9899/9900=?
找规律填空:1/2、5/6、11/12、19/20、( )、41/42
1/2+5/6+11/12+19/20+29/30+41/42+55/56=怎麽做?
计算:1/2+5/6+11/12+19/20+……+89/90+109/110=
找规律填数1/2,5/6,11/12,19/20,( ),41/42.
1/2+5/6+11/12+19/20+29/30+41/42=?=多少
1/2+5/6+11/12+19/20+...9701/9702+9899/9900怎么解
1/2+5/6+11/12+19/20+29/30+...+9701/9702+9899/9900
请问:1/2+5/6+11/12+19/20+29/30+.+9701/9702+9899/9900=?
1/2+5/6+11/12+19/20+...+89/90+109/110简便运算十加十加十加十万火急
1/2+5/6+11/12+19/20+...+89/90+109/110的值是?
1/2+5/6-7/12+9/20-11/30.-19/90+21/110
1-3/2+5/6-7/12+9/20-11/30+.-19/90+21/110=?
1/2+5/6+11/12+19/20+.+379/380=
1/2+5/6+11/12+19/20+……+209/210+239/240