利用平方差公式计算(1+1⼀2)(1+1⼀4)(1+1⼀16)(1+1⼀256)急

2025-02-27 16:46:17
推荐回答(2个)
回答1:

原式=(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)
=(1-1/16)(1+1/16)(1+1/256)/(1-1/2)
=(1-1/256)(1+1/256)/(1-1/2)
=(1-1/65536)/(1/2)
=65535/65536×2
=65535/32768

回答2:

上式乘(1-1/2)/(1+1/2)得
(1-1/256^2)/(1-1/2)