2个回答
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(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)(1+1/2^16)(1+1/2^32)
这个式子左边乘以再除以(1-1/2)
则式子变为(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)(1+1/2^16)(1+1/2^32)/(1-1/2)
=(1-1/2^2)*(1+1/2^2)(1+1/2^4)(1+1/2^8)..(1+1/2^32)/(1-1/2)
=(1-1/2^4)*(1+1/2^4)(1+1/2^8)..(1+1/2^32)/(1-1/2)
=……(看出来了吗,平方差公式一项项消掉了)
=(1-1/2^64)*2
=2-1/2^63
这个式子左边乘以再除以(1-1/2)
则式子变为(1-1/2)(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)(1+1/2^16)(1+1/2^32)/(1-1/2)
=(1-1/2^2)*(1+1/2^2)(1+1/2^4)(1+1/2^8)..(1+1/2^32)/(1-1/2)
=(1-1/2^4)*(1+1/2^4)(1+1/2^8)..(1+1/2^32)/(1-1/2)
=……(看出来了吗,平方差公式一项项消掉了)
=(1-1/2^64)*2
=2-1/2^63
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