(1+1/2)*(1+1/4)*.*(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)简算
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(1+1/2)*(1+1/4)*.*(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)简算
(1+1/2)*(1+1/4)*.*(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)简算
(1+1/2)*(1+1/4)*.*(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)简算
你好:
(1+1/2)*(1+1/4)*.*(1+1/10)*(1-1/3)*(1-1/5)*.(1-1/9)
=(1+1/2)*(1+1/4)*(1+1/6)*(1+1/8)*(1+10/1)*(1-1/3*.*(1-1/9)
=3/2*5/4*7/6*9/8*11/10*2/3*4/5*6/7*7/8*8/9
=(3/2*2/3)(5/4*4/5)(7*6*6/7)(9/8*8/9)*11/10
=11/10
用第一项与第六项相乘,第二项与第七项相乘,依次类推即可得出答案 11/10
原式化为2/3X5/4X..........X11/10X2/3X4/5X8/9=2/3X2/3X5/4X4/5X........X8/9X9/8X10/9X11/10=11/9
就是将后面的括号里为减号得依次提到前面对应相应的式子,(1+1/2)与(1-1/3)是倒数,相乘等于一,依此类推
应该是11/9,不是11/10,前面多出了两项,10/9和11/10
(1+1/2)*(1-1/3)=1同样(1+1/4)*(1-1/5)=1……所以结果=(1+1/10)=1.1