1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/07/16 15:16:46
1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88
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39*148/149+148*149/86+48*14/149
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(1-1/2*2)*(1-1/3*3)*```````*(1-1/10*10)
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1/1+2 + 1/1+2+3 + 1/1+2+3+4 + ```````1/1+2+3+````+50
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要清楚 这有点难度 所以
欧也!
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39*148/149+148*149/86+48*14/149
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(1-1/2*2)*(1-1/3*3)*```````*(1-1/10*10)
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1/1+2 + 1/1+2+3 + 1/1+2+3+4 + ```````1/1+2+3+````+50
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要清楚 这有点难度 所以
欧也!
1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88
7/36=(3+4)/(4*9)=1/12+1/9
29/56=(21+8)/(7*8)=3/8+1/7
37/63=(28+9)/(7*9)=4/9+1/7
41/72=(32+9)/(8*9)=4/9+1/8
53/77=(42+11)/(7*11)=6/11+1/7
29/84=(36-7)/(7*12)=3/7-1/12
3/88=(11-8)/(8*11)=1/8-1/11
所以 通加就是
1/7+3/8+1/12+1/9+3/8+1/7+4/9+1/7+4/9+1/8+6/11+1/7+3/7-1/12+1/8-1/11=1+1+1+5/11=38/11
是这样的吗:
39*148/149+148*86/149+48*74/149
=(39*148+86*148+24*2*74)/149
=(39+86+24)*148/149
=149*148/149
=148
(1-1/2*2)*(1-1/3*3)*```````*(1-1/10*10)
(1-1/2^2)=(1-1/2)(1+1/2)=1/2*3/2
(1-1/3^2)=(1-1/3)(1+1/3)=2/3*4/3
...
(1-1/9^2)=8/9*10/9
(1-1/10^2)=9/10*11/10
(1-1/2^2)(1-1/3^2)(1-1/4^2)...(1-1/9^2)(1-1/10^2)
=1/2*3/2*2/3*4/3*...*8/9*10/9*9/10*11/10
=1/2*11/10
=11/20
1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+…+1/(1+2+3+…+49)+1/(1+2+3+…+50)
=1/[(1+2)*2/2]+1/[(1+3)*3/2]+1/[(1+4)*4/2]+……+1/[(1+50)*50/2]
=2/(2*3)+2/(3*4)+2/4*5+……+2/(100*99)
=[1/2*3+1/3*4+1/4*5+.+1/50*51]*2
=(1/2-1/3+1/3-1/4+1/4-1/5+……+1/50-1/51)*2
=(1/2-1/51)*2
=49/102*2
=49/51
7/36=(3+4)/(4*9)=1/12+1/9
29/56=(21+8)/(7*8)=3/8+1/7
37/63=(28+9)/(7*9)=4/9+1/7
41/72=(32+9)/(8*9)=4/9+1/8
53/77=(42+11)/(7*11)=6/11+1/7
29/84=(36-7)/(7*12)=3/7-1/12
3/88=(11-8)/(8*11)=1/8-1/11
所以 通加就是
1/7+3/8+1/12+1/9+3/8+1/7+4/9+1/7+4/9+1/8+6/11+1/7+3/7-1/12+1/8-1/11=1+1+1+5/11=38/11
是这样的吗:
39*148/149+148*86/149+48*74/149
=(39*148+86*148+24*2*74)/149
=(39+86+24)*148/149
=149*148/149
=148
(1-1/2*2)*(1-1/3*3)*```````*(1-1/10*10)
(1-1/2^2)=(1-1/2)(1+1/2)=1/2*3/2
(1-1/3^2)=(1-1/3)(1+1/3)=2/3*4/3
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(1-1/9^2)=8/9*10/9
(1-1/10^2)=9/10*11/10
(1-1/2^2)(1-1/3^2)(1-1/4^2)...(1-1/9^2)(1-1/10^2)
=1/2*3/2*2/3*4/3*...*8/9*10/9*9/10*11/10
=1/2*11/10
=11/20
1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+…+1/(1+2+3+…+49)+1/(1+2+3+…+50)
=1/[(1+2)*2/2]+1/[(1+3)*3/2]+1/[(1+4)*4/2]+……+1/[(1+50)*50/2]
=2/(2*3)+2/(3*4)+2/4*5+……+2/(100*99)
=[1/2*3+1/3*4+1/4*5+.+1/50*51]*2
=(1/2-1/3+1/3-1/4+1/4-1/5+……+1/50-1/51)*2
=(1/2-1/51)*2
=49/102*2
=49/51
1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88
如何1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88
1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88=?
7\1+8\3+36\7+56\29+63\27+72\41+77\53+84\29+88\3
1/7+3/8+7/36+29/56+37/63+42/72+53/77+29/84+3/88=?
1/7+3/8+7/36+29/56+37/63+41/72+53/77+29/84+3/88=?先给10,再给50哦!
7分之1+8分之1+56分之29+36分之7+72分之41+63分之37+77分之53+88分之3+84分29
7分之1+8分之3+36分之7+56分之29+63分之37+72分之41+77分之53+84分之29+88分之3=?请各
2 3 5 7 11 13 17 19 23 29 31 37 41 13 47 51 53 59 61 67 71 7
找规律 2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 7
2、3、5、7、11、13、17、19、23、29、31、37、41、43、47、53、59、61 问:这些数除了三的倍
1/1*2+2/2*4+3/4*7+4/7*11+5/11*16+6/16*22+7/22*29+8/29*37