goi so can tim la ab [ a khac 0 ;a;b<10]
theo de ra ta biet
ab =[a-b] nhan 21
a nhan 10 +b=a nhan 21-b nhan 21
a nhan 10=a nhan 21-b nhan 22
a nhan 21-a nhan 10= b nhan 22
Tim so tu nhien co 2 chu so . Biet rang so do gap 24 lan hieu cua chu so hang chuc va hang don vi
tim so co 3 chu so biet rang tong cua so do va 5 lan tich chu so hang chuc va hang dv la 175
tim mot so co hai chu so biet rang so do gap 7 lan tong cua no va chu so hang chuc hon chu so hang don vi la 4
Tim so ca hai chu so biet so do gap 21 lan hieu cua chu so hang chuc va hang don vi GIAI Cach Lam Luon cho Minh nha
tim so tu nhien co ba chu so,biet rang neu viet them mot chu so 0 vao giua chu so hang tram va hang chuc cua so do duoc mot so gap 6 lan so do.
Tim so chan co 4 chu so biet so tao nen boi chu so hang tram va chu so hang chuc gap 4 lan chu so hang dv va gap 3 lan chu so hang nghin
cho so co 2 chu so ma hang chuc chia het cho chu so hang don vi tim so da cho biet rang khi chia so do cho hieu cua chu so hang chuc va chu so hang don vi thi duoc thuong la 15 va du 2
tim mot so tu nhien co 2 chu so, biet rang neu ta viet them chu so 0 vao giua chu so hang chuc va chu so hang don vi cua so do ta duoc so moi gap 7 lan so ban dau
tim so tu nhien co 2 chu so biet rang neu viet chu so 0 xen giua chu so hang chuc va hang don vi cua so do ta duoc so moi gap 10 lan so can tim . Neu viet them chu so 1 vao ben trai so vua nhan duoc thi so do gap len 3 lan . So can tim la
