51/2* 52/2* ....*100/2 = [ 51*53*55*..*99 ]*[52*54*56*...*100]/2^50
= [ 51*53*55*..*99 ]*[26*27*28*...*50]*2^25/2^50
= [ 51*53*55*..*99 ]*[27**29*...*49]*[26*28*30*..50)/2^25
tiếp tục phân tích 26*28*30*..50 / 2^25 sẽ suy ra kết quả
hok tốt
dm cúttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt
bố tao cũng không giải được chép sai bài rồi
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