ban dgk3593 oi bai` 1 hinh nhu ban thieu nghiem oi` vi x=5 y=3 z=6 cung duoc ma` (5!*3! =1*2*3*4*5*6 = 6! ) ma`Added (2008-10-07, 12:52 Pm)
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sr moi ng` cho di'nh chi'nh lai ba`i 2 la tim x,y,z,n thuoc tap hop so nguyen sao cho thoa pt sau
((5*10^n) -2)x = 3 (yyy....z) (n-1 chu so y ) ( voi yyy...z la mot day so ( ko fai tich ) )