小学法制安全手抄报:简单的加法。。
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(2/3)+(2/3)^2+(2/3)^3+.........(2/3)^10=
(2/3)+(2/3)^2+(2/3)^3+.........(2/3)^10
=[1-(2/3)^11]/(1-2/3)
=3[1-(2/3)^11]
(2/3)+(2/3)^2+(2/3)^3+.........(2/3)^10
=[1-(2/3)^11]/(1-2/3)
=3[1-(2/3)^11]