1-1/2= 1-1/2-1/4= 1-1/2-1/4-1/8= 算一算,找规律
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1-1/2= 1-1/2-1/4= 1-1/2-1/4-1/8= 算一算,找规律
1-1/2= 1-1/2-1/4= 1-1/2-1/4-1/8= 算一算,找规律
1-1/2= 1-1/2-1/4= 1-1/2-1/4-1/8= 算一算,找规律
1-1/2=1/2,1-1/2-1/4=1/4,1-1/2-1/4-1/8=1/8,.
规律:计算结果后一项为前一项的1/2.
(1-1/2)*(1-1/3)*(1-1/4)*...*(1-1/99)*(1-1/100)=
1/2+1/3+1/4=?
1/2-3/1-4/1=
1+1/2+1/4+1/8+...1/64=?
(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*(1+1/4)*(1-1/4)*(1+1/5)*(1-1/5)=?
(1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8)+1/2^15=?
1*1/2=?
1+1=2?
1+1=2?
1+1×2=?
2-1=1
1/2+1/4+1/8+...+1/2n=?
巧算:(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=====
1+(1/1+2)+(1/1+2+3)+(1/1+2+3+4)+(1/1+2+3+4+...+100)=?
求和:sn=1/2^2-1+1/4^2-1+.1/(2n)^2-1
(1+1/2)(1+1/3)(1+1/4)...(1+1/2009)=
(1-1/2)乘(1-1/3)乘(1-1/4).乘(1-1/2000)=?