(1+1/2)(1+1/4)(1+1/16)(1+1/256)=?用平方差公式计算 .
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/02 14:14:29
![(1+1/2)(1+1/4)(1+1/16)(1+1/256)=?用平方差公式计算 .](/uploads/image/z/387978-42-8.jpg?t=%281%2B1%2F2%29%281%2B1%2F4%29%281%2B1%2F16%29%281%2B1%2F256%29%3D%3F%E7%94%A8%E5%B9%B3%E6%96%B9%E5%B7%AE%E5%85%AC%E5%BC%8F%E8%AE%A1%E7%AE%97+.)
xQN@~9Rn= >>!\HDM66 œobJO}XA&fgov~TCH
5J7$̯|^0ua_îztBCW n~nbY2b3imlR[hM:tBt9F"ոi>SkhFQSd/JNcF;5xV(>ߛML~4QRp[T ]Nw'
چ W#jRiI=og-\#rcԙ1
(1+1/2)(1+1/4)(1+1/16)(1+1/256)=?用平方差公式计算 .
(1+1/2)(1+1/4)(1+1/16)(1+1/256)=?用平方差公式计算 .
(1+1/2)(1+1/4)(1+1/16)(1+1/256)=?用平方差公式计算 .
小技巧 乘一个除一个(1-1/2) 即可 你自己试试(1-1/2)(1+1/2)(1+1/4)(1+1/16)(1+1/256)÷(1-1/2)=(1-1/4)(1+1/4)(1+1/16)(1+1/256)÷(1-1/2)=……=(1-1/256)(1+1/256)÷1/2=65535/32768
原式=(1-1/2)*(1+1/2)*(1+1/4)*(1+1/16))*(1+1/256)/(1-1/2) =(1-1/2)*(1+1/2)=1-(1/2)=1-1/4 =(1-1/2)*(1+1/2)*(1+1/4) =(1-1/4)*(1+1/4) =1-1/16 反复用平方差 且分母1-1/2=1/2 就是(1-1/256)/(1/2) =2(1-1/256) =2-2/256 (关键在于先乘以1-1/2,再除以1-1/2)