無窮等比級數的問題.....高一數學

1. 求最小正整數n..使得1/2 + 1/4 + ....+1/2的n次方 > 99/100 2. 一公比為 r 的無窮等比級數，其首項為 r 平方 且和為 1 求公比r ?3. 已知一無窮等比級數的和為2 ， 各項立方和為8/7，則公比為何4. 已知一無窮等比級數的和為9/2，其第2項為-2，若級數前n項和為Sn，則這個級數的首項為_____；又若Sn與9/2差的絕對值小於10的-4次方，則n的最小值?? !--<! /* Font Definitions */ @font-face {font-family:新細明體; panose-1:2 2 3 0 0 0 0 0 0 0; mso-font-alt:PMingLiU; mso-font-charset:136; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:3 135135232 22 0 1048577 0;}@font-face {font-family:"Cambria...

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分項對消法與無窮等比

因為最近在上無窮等比級數但是有的我聽不太懂 所以想來發問看有沒有人能夠幫我一下謝謝 要有過程噢感恩:D(1)求Sigma(n=2->無限); 1/n^2-1=?(2)求&Sigma(n=2->無限); 1/n^3-n=?(3)求&Sigma(n=1->無限); 1/1+2+......+n=?(4)設無窮等比級數之和為2，各項平方和為12，則各位立方和為? Normal 0 0 2 false false false EN-US ZH-TW X-NONE w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="true" DefSemiHidden="true"...

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abcdx9=dcba

abcdx9=dcba這提數學我混了好久都沒想到怎麼算只好請大大幫個忙啦問:a  b  c  d        X 9--------------d  c  b  a 答:1089&nb...

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[挑戰題]因式分解難題(B)

1) x^2+y^3+xy^2+2xy-12) x^4-4y^4-4xy^3-(xy)^23) (xy+2)^2 - (x-y)^2 -4xy4) (2x-y)(x+y)-3y-25) a^4+a^2-2ab-b^2+1 !--<! /* Font Definitions */ @font-face {font-family:新細明體; panose-1:2 2 3 0 0 0 0 0 0 0; mso-font-alt:PMingLiU; mso-font-charset:136; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:3 135135232 22 0 1048577 0;}@font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0...

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[挑戰題]因式分解難題(A)

1) 怎樣判斷一個多項式已經無法再分解了? 如下....甲----x^4+4乙----x^8+64丙----x^4-x^2+1丁----x^3+x^2-2戊----x^4+12) 何者非x^6-1之因式?甲----(x+1)乙----(x^2+1)丙----(x^2-x-1)丁----(x^4+x^2+1)3)因式分解...bx^2+a^2b-(2ab-a^2)x+x^3-2ax^24)因式分解...(x+y)(xy+1)+5xy+(xy-1)^2!--<! /* Font Definitions */ @font-face {font-family:新細明體; panose-1:2 2 3 0 0 0 0 0 0 0; mso-font-alt:PMingLiU; mso-font-charset:136; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:3 135135232 22 0 1048577 0;}@font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0...

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等差等比.....高一數學

級數1+2‧(1/3)+3‧(1/3)^2+.......+n‧(1/3))^n-1之和為?!--<! /* Font Definitions */ @font-face {font-family:新細明體; panose-1:2 2 3 0 0 0 0 0 0 0; mso-font-alt:PMingLiU; mso-font-charset:136; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:3 135135232 22 0 1048577 0;}@font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0 0;}@font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-1610611985...

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反推ln方程式

y = 8.75Ln(x) + 67.574這是我的方程式，已知y=10那Ｘ答案為多少呢？!--<! /* Font Definitions */ @font-face {font-family:新細明體; panose-1:2 2 3 0 0 0 0 0 0 0; mso-font-alt:PMingLiU; mso-font-charset:136; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:3 135135232 22 0 1048577 0;}@font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0 0;}@font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-1610611985...

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