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Tim so chinh phuong co 4 chu so dang aabb.
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1)viet day tu nhien tu 1-101 tao thanh so A
a) A co phai hop so khong
b)A co phai so chinh phuong khong
c)A co the co 35 uoc khong
2)tim so chinh phuong co 4 chu so chu so hang nghin bang chu so hang don vi va so do co the viet duoi dang (5n+4)2
tim so chinh phuong co 4 chu so sao cho 2 chu so dau tao thanh so chinh phuong va 2 chu so cuoi cung tao thanh so chinh phuong
tim a, b de A= aabb la so chinh phuong . Trong do aabb la 1 STN co 4 cs
tim so chinh phuong co 4 chu so ,biet rang neu lay chu so hang nghin tru di 3, chu so hang don vi cong them 3 thi duoc so moi cung la so chinh phuong
tim so co 4 chu so abcd, biet rang abd la so chinh phuong, neu cong them 72 don vi thi duoc mot so chinh phuong
tim so chinh phuong co 4 chu so gom ca bon chu so 7,4,2,0
mot so chinh phuong co chu so hang chuc la mot so le . tim chu so tan cung cua so chinh phuong do
tim so tu nhien lon hon 0 sao cho tong
1!+2!+...+n! la so chinh phuong
b)tim 1 so co 4 chu so sao cho so do vua la s chinh phuong vua la so lap phuong