1/2+5/6+11/12+19/20+29/30=简便计算
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1/2+5/6+11/12+19/20+29/30=简便计算
1/2+5/6+11/12+19/20+29/30=
简便计算
1/2+5/6+11/12+19/20+29/30=简便计算
1/2+5/6+11/12+19/20+29/30
=(1-1/2)+(1-1/6)+(1-1/12)+(1-1/20)+(1-1/30)
=[1-(1-1/2)]+[1-(1/2-1/3)]+[1-(1/3-1/4)]+[1-(1/4-1/5)]+[1-(1/5-1/6)]
=1-1+1/2+1-1/2+1/3+1-1/3+1/4+1-1/4+1/5+1-1/5+1/6
=4+1/6
=4又1/6
4又1/6
1/2+5/6+11/12+19/20+29/30
=1/2+(1-1/6)+(1-1/12)+(1-1/20)+(1-1/30)
=1/2+1-1/2+1/3+1-1/3+1/4+1-1/4+1/5+1-1/5+1/6
=1+1+1+1+1/6
=25/6
=(1-1/2)+(-1/6)+(1-1/12)+(1-1/20)+(1-1/30)
=1+1+1+1+1-(1/2+1/6+1/12+1/20+1/30)
=5-(30/60+10/60+5/60+3/60+2/60)
=5-5/6
=4又1/6
高手风范不同凡响!
拆项:1/n(n+1)=1/n-1/(n+1)
1/2+5/6+11/12+19/20+29/30
=5-(1/1*2+1/2*3+1/3*4+1/4*5+1/5*6)
=5-(1/1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=5-(1/1-1/6)
=4又1/6
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