1+3+1/6+5+1/12+7+1/20+9+1/30+11+1/42+13+1/56+15+1/72+17+1/90+19+1/110
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/15 00:57:14
1+3+1/6+5+1/12+7+1/20+9+1/30+11+1/42+13+1/56+15+1/72+17+1/90+19+1/110
1+3+1/6+5+1/12+7+1/20+9+1/30+11+1/42+13+1/56+15+1/72+17+1/90+19+1/110
1+3+1/6+5+1/12+7+1/20+9+1/30+11+1/42+13+1/56+15+1/72+17+1/90+19+1/110
原式
=(1+3+5+……+19)+(1/6+1/12+1/20+……+1/110)
=(1+19)x10÷2+(1/2x3+1/3x4+1/4x5+……+1/10x11)
=100+(1/2-1/3+1/3-1/4+1/4-1/5+……+1/10-1/11)
=100+(1/2-1/11) (中间正负抵消了)
=100+(11/22-2/22)
=100又9/22
1+3+1/6+5+1/12+7+1/20+9+1/30+11+1/42+13+1/56+15+1/72+17+1/90+19+1/110
=1+3+5+7+9+11+13+15+17+19+1/2-1/3+1/3-1/4+……+1/9-1/10+1/10-1/11
=50+1/2-1/11
=50+9/22
(1/2-3-5/9+5/6-7/12)*(-36)
6/7x(2/3-1/2)/5/12
1/2+3/2:;1/6+5/6;1/12+7/12;1/20+9/20:第五个是( )
数学1-(5/2+3/1),8/7-12/5+6/1,12/11-4/1-3/1,7/2+(9/4+7/5)写出过程
(2/3-5/6-7/8+1/12)*(-24)=?
1+2+3+4+5+6+7+8+9+12
1/2,3/6,5/12,7/20,( ),( ).找规律
1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12的整数部分是几,为啥
1+1-1+1+1+2+3+4+5+6+7+8+9+0+1+12+...+99+100
1:1/5×[1/3÷(1/2+5/6)] 2:1-(1/6×2/5)÷7/9 3:12÷(1-31:1/5×[1/3÷(1/2+5/6)]2:1-(1/6×2/5)÷7/93:12÷(1-3/7)4:4/5×2/3-1/6÷1/25:(1/2+1/3)÷(1-3/8)6:[(1-3/5)×2/3]÷4
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9=1-1/9=8/9为什么呢?写出解析.
x-1/6【12-6(3/5x+1】=3/7-2
解x-1/6[12-6(3/5x+1)]=3/7x-2
简便计算:1、1/3+1/6+1/10+1/15+1/21+1/28+.+1/1202、1/4+1/12+1/24+1/40+.+1/198003、1+1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+.+1/(1+2+3+4+.+50)4、(3*3-1)/(3*3+1)+(5*5-1)/(5*5+1)+(7*7-1)/(7*7+1)+.+(1995*1995-1
1/2=1-1/2,1/6=1/2-1/3,1/12=1/3-1/4..根据以上规律计算下面题目:1/2*1/3+1*3*1/4+1/4*1/5+1/5*1/6+1/6*1/7+1/7*1/8
计算:1 6/1+2 12/1+3 20/1+4 30/1+5 42/1+6 56/1+7 72/1
((1/2)-1)*((1/3)-1)*((1/4)-1)*((1/5)-1)*((1/6)-1)*((1/7)-1)*((1/8)-1)*((1/9)-1)*((1/10)-1)
把1/2,1/3,1/4,1/6,2/3,3/4,1/12,5/12,7/12填入九个方格中,是每一横行,竖行,斜行,