1+1/4+1/16+1/64+1/256+1/1024
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/07 21:36:25
1+1/4+1/16+1/64+1/256+1/1024
1+1/4+1/16+1/64+1/256+1/1024
1+1/4+1/16+1/64+1/256+1/1024
等比数列,有求和公式
如果没学,可以用错位相减
设m=1+1/4+1/16+1/64+1/256+1/1024
同时乘1/4,得:
1/4m=1/4+1/16+1/64+1/256+1/1024+1/4096
错位相减,得:
3/4m=1-1/4096=4095/4096
m=4095/4096*4/3=1365/1024
法一;1+1/4=5/4;5/4+1/16=21/16;21/16+1/64=85/64;……
法二:此为等比数列据等比数列公示:(1*(1-1/(4)^6))/(1-1/4)=1365/1024
1,4,9,16,25,( ),( ),64,81
1,4,9,16,25?64,81
(1-1/4)(1-1/9)(1-1/16)(1-1/25)(1-1/36)(1-1/49)(1-1/64)(1-1/81)(1-1/100)
(1-1/4)(1-1/9)(1-1/16)(1-1/25)(1-1/36)(1-1/49)(1-1/64)(1-1/81)(1-1/100)
找规侓 1,1,4,8,9,27,16,64,25,(),()
1,4,9,16,25,()49,64,(),(),
1,9,16,25,64,81
计算行列式1,1,1,1;2,3,4,5;4,9,16,25;16,27,64,125计算行列式1,1,1,1;2,3,4,5;4,9,16,25;16,27,64,125
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
1/2-1/4-1/8-16/1-32/1-64/1-128/1-256/1
1/2-1/4-1/8-1/16-1/32-1/64-1/128-1/256
1/2+1/4+1/8+1/16+1/32+1/64+1/128+.+1/1024
1-2/1-4/1-8/1-16/1-32/1-64/1-128/1
1/2-1/4-1/-1/8-1/16-1/32-1/64----------1/1024
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
线性代数问题 设D=1 1 1 1 2 3 4 5 4 9 16 25 16 27 64 125 求D的值1 1 1 12 3 4 54 9 16 25 16 27 64 125
(1-1/4)(1-1/9)(1-1/16)(1-1/25)...(1-1/10000)
速度(1-1/4)×(1-1/9)×(1-1/16)×(1-1/25)×.×(1-1/10000)