1⼀2(1+1⼀2)(1+1⼀4)(1+1⼀16)用简便方法

2024-12-28 07:21:47
推荐回答(3个)
回答1:

1/2(1+1/2)(1+1/4)(1+1/16)
=(1-1/2)(1+1/2)(1+1/4)(1+1/16)
=(1-1/4)(1+1/4)(1+1/16)
=(1-1/16)(1+1/16)
=1-1/256
=255/256

回答2:

(1-1/2)(1+1/2)(1+1/4)(1+1/16)=(1-1/4)(1+1/4)(1+1/16)=(1-1/16)(1+1/16)=1-1/256=255/256

回答3:

(1-1/2)(1+1/2)(1+1/4)(1+1/16)
=【1-(1/2)²】(1+1/4)(1+1/16)
=(1-1/16)(1+1/16)
=1-1/256=255/256