viết 8 thành tích của 3 số khác nhau (viết 6 cách khác nhau)
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2000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
tức là từ 9h sáng đến 22 giờ đêm
=> có số giờ là : (22-9) : 1 +1 =14(số)
Đ/s
1*2*4
2*1*4
4*2*1
4*1*2
1*4*2
2*4*1
nhớ
8=1*2*4
8=1*1*8
8=2*1*4
8=8*1*1
8=4*2*1
8=1*8*1
kết bạn nha