De bai cho biet so co 4 chu so, 3 chu so dau bang 14,tong 3 chu so sau bang 15,chu so hang chuc lon hon hang don vi la 4
ta co 3 chu so dau bang 4 : 176
tong 3 chu so sau bang 15 : 762
chu so hang chuc lon hon chu so hang don vi la 4 : chu so hang chuc la 6; hang don vi la 2 vay6-2=4
vay so tu nhien do la 1762 [mot like cho minh nhe]