tim 2 so tu nhien biet neu gap ca 2 so do len 3 lan thi duoc 2 so moi co tong bang 432 va ti so la 1/5

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1. tim so tu nhien co 3 chu so,biet so do gap 20 lan tong cac chu so cua no

2. tim so tu nhien co 2 chu so, biet rang neu lay so do chia cho hieu cua chu so hang chuc va hang don vi, thi ta duoc thuong la 28 du 1

3. tim 1 so tu nhien co ba chu so , biet rang neu chuyen chu so cuoi len truoc chu so dau ta duoc so moi hon so da cho 765 don vi

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

tim 2 so thap phan co tong la 84,99 , biet neu moi so do gap len 100 lan thi khi do 2 so la so tu nhien va co hieu la 749

tim so tu nhien co 2 chu so ,biet rang neu viet them 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.

tim so tu nhien co hai chu so biet rang neu viet chu so 0 xen giua so hang chuc va hang don vi cua so do ta duoc so moi gap 10 lan so phai tim neu viet chu so 1 vao ben traiso vua nhan thi so do gap len 3 lan

tim 2 so , biet rang so lon gap so be 12 lan va neu giam so lon di 4 lan va tang so be len 2 lan thi duoc 2 so moi co tong la 60 . tim 2 so

tim mot so tu nhien co 3 chu so biet rang neu chuyen chu so 7 tan cung cua so do len dau thi duoc mot so moi gap 2 lan so cu va them 21 don vi

Tim hai so co tong bang 61 . Biet rang gap 3 lan o so hang thu nhat va gap so hang thu hai len 5 lan thi duoc tong moi la 229.