1/2*2 – 1/2*4 + 1/2*6 – 1/2*8 + …. +1/2*2002 – 1/2*2004 < 0,2 chứng minh
1/2*2 – 1/2*4 + 1/2*6 – 1/2*8 + …. +1/2*2002 – 1/2*2004 < 0,2 chứng minh
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1/2*2 – 1/2*4 + 1/2*6 – 1/2*8 + …. +1/2*2002 – 1/2*2004 < 0,2 chứng minh