
1/2+1/2的二次方+1/2的三次方+……+1/2的十次方=?
2个回答
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1/2+1/2的平方+1/2的三次方+……+1/2的n次方
=(1/2+1/2的平方+1/2的三次方+……+1/2的n次方)*2-(1/2+1/2的平方+1/2的三次方+……+1/2的n次方)
=(1+1/2+1/2的平方+……+1/2的n-1次方)-(1/2+1/2的平方+1/2的三次方+……+1/2的n次方)
=1-1/2的n次方
=(1/2+1/2的平方+1/2的三次方+……+1/2的n次方)*2-(1/2+1/2的平方+1/2的三次方+……+1/2的n次方)
=(1+1/2+1/2的平方+……+1/2的n-1次方)-(1/2+1/2的平方+1/2的三次方+……+1/2的n次方)
=1-1/2的n次方
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