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=[(1+1/2)x(1-1/2)×[(1+1/3)x(1-1/3)]x...x[(1+1/99)x(1-1/99)]=[(1x3)/(2x2)]x[(2x4)/(3x3)]x...x[(98x100)/(99x99)]=[(99)(100)(98!)^2/2]/(99!)^2 =50/99
求大神解答 (1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×...×(1+1/99解:(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*...*(1+1/99)*(1-1/99)=(1-1/2)(1+1/2)(1-1/3)(1+1/3)……(1-1/99)(1+1/99)=(1/2)(3/2)(2/3)(4/3……(98/99)(100/99)中间约分 =(1/2)x(100/99)=50/99 ...
简便运算:(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*...*(1+1/99)*(1-1/99...先把括号里的约分得到:3/2*1/2*4/3*2/3...*97/98*99/98*100/99*98/99 之后会发现中间所有之积得1,最后剩个1/2和100/99相乘 结果就是,你知道的50/99
如何巧算(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)...(1+1/99)×?原式=(3/2x4/3x…x100/99)x(1/2x2/3x…x98/99)=100/2x1/99 =50/99
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*.……(1+1/99)*(1-1/99)的简便...(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*...*(1+1/99)(1-1/99)=(1+1/2)(1+1/3)...(1+1/99)(1-1/2)(1-1/3)...(1-1/99)=[3/2*4/3...100/99]*[1/2*2/3...98/99]=100/2*1/99 =50/99
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*...*(1+1/99)*(1-1/99)用简便方法计 ...(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*...*(1+1/99)*(1-1/99)=(1-(1/2)^2)(1-(1/3)^2)*...*(1-(1/99))^2 =(1-1/4)(1-1/9)(1-1/16)*...*(1-1/9801)=(3/4)*(8/9)*(15/16)*...*(9800/9801)=2*2*......
99*(1-1/2)*(1-1/3)*(1-1/4)*···*(1-1/99)简便方法怎么算99*(1-1/2)*(1-1/3)*(1-1/4)*···*(1-1/99)=99*1/2*2/3*3/4*...*97/98*98/99 =99*1/99 =1
(1-1/2)乘(1-1/3)乘(1-1/4)乘……乘(1-1/99)1-1/2)*(1-1/3)*(1-1/4)*...*(1-1/99)*(1-1/100)=1/2 * 2/3 * 3/4 *...* 97/98 * 98/99*99/100 =1/100 注意:写成分数形式后,发现前一项分母与后一项分子可以抵消,所以结果就等于100分之1 有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)...
数学题:(1-1/2)X(1-1/3)X(1-1/4)...X(1-1/199)=?(1-1/2)X(1-1/3)X(1-1/4)...X(1-1/199)=(1/2)×(2/3)×(3/4)×……×(198/199) {前一个的分母与后一个的分子可以约掉,最后分子是1,分母只剩下最后一个199} =1/199
简便运算:(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*...*(1+1/99)*(1-1/99...(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*...*(1+1/99)*(1-1/99)*(1+1/100)*(1-1/100)= 3/2 * 1/2 *4/3 *2/3 *5/4 *3/4 *……* 100/99 * 98/99 *101/100 *99/100 =1/2*(3/2*2/3)*(4/3*3/4)*(5/4*4/5)……*(100/99*99/100)*101/...