数学题1/2+1/4+1/8+1/16+1/32+1+641/2+1/4+1/8+1/16+1/32+1+64` 高手` 帮帮忙```还有 1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)
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