﹙a+b+c﹚² ;-﹙a-b+c ﹚²
|a+b+m|²+﹙a-b+﹚²=0求a²-b²
﹙1+1/2﹚﹙1+1/2²﹚﹙1+1/2⁴﹚﹙1+1/2﹙八次幂﹚﹚ 1+1/2﹙15次方﹚处理提问
|a+b+m|²+﹙a-b+﹚²=0求a²-b²
追答题目写完全。
追问|a+b+m|²+﹙a-b+n﹚²=0求a²-b²
追答|a+b+m|=0;﹙a-b+n﹚=0;这一步晓得不?
然后化简a+b=-m;a-b=-n;
a²-b²=mn;
﹙1+1/2﹚﹙1+1/2²﹚﹙1+1/2⁴﹚﹙1+1/2﹙八次幂﹚﹚ 1+1/2﹙15次方﹚
追答(2+1)(2^2+1)(2^4+1)(2^8+1)(2^15+1)/(2*2^2*2^4*2^8*2^15),我只化到这一步,而且,分子的指数的和有规律,1+2+4+8=15.不好意思,只做到这一步,希望能给你带来灵感。
本回答被提问者采纳5 12 22 33,....这组数据有什么规律?第n个数是多少? 1 小时前 提问者: litong98765432 | 悬赏分:5 | 浏览次数:9次
问题补充:
是摆棋子
﹙1+1/2﹚﹙1+1/2²﹚﹙1+1/2⁴﹚﹙1+1/2﹙八次幂﹚﹚ 1+1/2﹙15次方﹚
...3二次幂)(1-1\/4二次幂)...(1-1\/99二次幂)(1-1\/100二次幂)
(1-1\/2²)(1-1\/3²)(1-1\/4²)...(1-1\/99²)(1-1\/100²)=(2²-1)\/2²×(3²-1)\/3²)×(4²-1)\/4²×···×(99²-1)\/99²×(100²-1)\/100²=(3×1)\/2²×(4×2)\/3&...
逆用平方差公式计算:(1-1\/2²)(1-1\/3²)(1-1\/4²)...(1-1\/10&
(1-1\/2²)(1-1\/3²)(1-1\/4²)...(1-1\/10²)=(1+1\/2)(1-1\/2)(1+1\/3)(1-1\/3)...(1+1\/10)(1-1\/10)=(1+1\/2)(1+1\/3)(1+1\/4)..(1+1\/10)(1-1\/2)(1-1\/3)(1-1\/4)...(1-1\/10)=3\/2×4\/3×5\/4×...×11\/10×...
﹙1-1\/2²﹚﹙1-1\/3²﹚﹙1-1\/4²﹚…﹙1-1\/100²﹚
﹙1-1/2²﹚﹙1-1/3²﹚﹙1-1/4²﹚…﹙1-1/100²﹚=(1+1\/2)(1-1\/2)(1+1\/3)(1-1\/3)(1+1\/4)(1-1\/4)……(1+1\/100)(1-1\/100)=3\/2*1\/2*4\/3*2\/3*5\/4*3\/4*...*101\/100*99\/100=(1\/2*2\/3*3\/4*...*99\/100)(3\/2*4...
...一减三的平方分之一乘以一减四的平方分之一……一减十平方分之一...
可以利用平方差公式进行简便运算:(1-1\/2²)×(1-1\/3²)×(1-1\/4²)×……×(1-1\/9²)×(1-1\/10²)=(1-1\/2)×(1+1\/2)×(1-1\/3)×(1+1\/3)×(1-1\/4)×(1+1\/4)×……×(1-1\/10)×(1+1\/10)=1\/2×3\/2×2\/3...
...1-1\/2²)(1-1\/3²)(1-1\/4²)···(1-
(1-1\/2²)(1-1\/3²)(1-1\/4²)···(1-1\/2002²)(1-1\/2003²)=(1-1\/2)(1+1\/2)(1-1\/3)(1+1\/3).(1-1\/2002)(1+1\/2002)(1-1\/2003)(1+1\/2003)=1\/2×3\/2×2\/3×4\/3×...2001\/2002×2003\/2002×2002\/2003×2004\/2003=1...
(1-1\/2⊃2;)(1-1\/3⊃2;)(1-1\/4⊃2;)...(1-1\/99⊃2;)(1-1\/10...
(1-1\/2²)(1-1\/3²)(1-1\/4²)...(1-1\/99²)(1-1\/100²=(1-1\/2)(1+1\/2)(1-1\/3)(1+1\/3)(1-1\/4)(1+1\/4)...(1-1\/99)(1+1\/99)(1-1\/100)(1+1\/100)=[(1-1\/2)(1-1\/3)(1-1\/4))...(1-1\/99)(1-1\/100)] * [(...
(1-1\/2²)(1-1\/3²)(1-1\/4²)...(1-1\/10²)
您好:(1-1\/2²)(1-1\/3²)(1-1\/4²)...(1-1\/10²)=(1-1\/2)(1+1\/2)(1-1\/3)(1+1\/3)(1-1\/4)(1+1\/4)。。。(1-1\/10)(1+1\/10)=1\/2x3\/2x2\/3x4\/3x3\/4x5\/4x...x9\/10x11\/10 =1\/2x11\/10 =11\/20 不明白,可以追问 如有...
(1-1\/2²)(1-1\/3²)(1-1\/4²)…(1-1\/n²)=?
解 (1-1\/2²)(1-1\/3²)(1-1\/4²)……(1-1\/n²)——平方差 =(1-1\/2)(1+1\/2)(1-1\/3)(1+1\/3)(1-1\/4)(1+1\/4)………(1-1\/n)(1+1\/n)=1\/2×3\/2×2\/3×4\/3×3\/4×………×(n-1)\/n×(n+1)\/n =1\/2×(n+1)\/n =(n+1)\/(...
因式分解(1-1\/2²)(1-1\/3²)…(1-1\/9²)(1-1\/10²)…(1-1\/...
(1-1\/2²)(1-1\/3²)…(1-1\/9²)(1-1\/10²)…(1-1\/n²)=(1+1\/2)(1-1\/2)(1+1\/3)(1-1\/3)。。。(1+1\/n)(1-1\/n)=3\/2*1\/2*4\/3*2\/3***(1+n)\/n*(n-1)\/n =1\/2*3\/2*2\/3*4\/3***(n-1)\/n*(1+n)\/n ...
(1-1\/2的2次方)(1-1\/3的2次方)(1-1\/4的2次方)..(1-1\/2003的2次方)
计算(1-1\/2²)(1-1\/3²)(1-1\/4²)...(1-1\/2008²)解:原式=(1-1\/2)(1+1\/2)(1-1\/3)(1+1\/3)(1-1\/4)(1+1\/4)...(1-1\/2008)(1+1\/2008)=(1\/2)(3\/2)(2\/3)(4\/3)(3\/4)(5\/4)(4\/5)(6\/5)......