TBC cua 5 so la 162.so thu 5 gap doi so thu 4 ,so thu 4 bang TBC cua 3 so dau tien .Tim so thu 5
1. tbc cua 3 so la 19/60 .neu gap so thu nhat len 4 lan thi tbc cua chung se la 13/20 .tim 3 so , biet so thu hai hon so thu ba 1/6
2. trong mot phep tru co tong so bi tru ,so tru va hieu la 1998.biet hieu so bang 4/5 so tru .hay tim so bi tru va so tru , hieu
Tbc cua 3 so la 975. So thu 2 gap ruoi so thu 3 va bang 3/10 so thu nhat. Tim so thu ba
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TBC cua ba so la 1996 . tim so thu tu biet rang so do bang tbc cua ba so kia
TBC cua 3 so la 20 neu tang so thu nhat len 2 lan thi TBC cua chung la 24 neu tang so thu 2 len 3 lan thi TBC cua chung la 32 tim so thu 3
Tong cua 2 so la 14. Neu them vao so lon 1,3don vi va bot o so be di 1,3 don vi thi so be bang 2/3so lon .Tim 2 so
Tong cua 3so bang 621.biet tong cua so thu nhat va so thu hai hon so thu 3 , 121 don vi.So thu hai hon so thu nhat 21 don vi . Tim so thu nhat?
hai so co tong bang 112,5. biet 1/2 so thu nhat bang 1/3so thu hai .tim so thu nhat la?
trung binh cong cua 3 so la 5/8 so thu ba bang trung binh cong cua so thu nhat va so thu hai so thu nhat hon so thu hai la 1/4 tim ba so do (viet dap so duoi dang so thap phan)
