TBC cua 3 so la 35 tim 3 so do biet rang so thu nhat gap doi so thu 2 so thu 2 gap 2 lan so thu 3
tim hai so biet rang tong hai so bang 2015, biet rang so thu nhat gap 3 lan so thu hai gap 5 lan thi duoc tong moi la 7557
1) Tich cua 2 so la 1400.Neu bot so thu nhat 5 don vi thi tich cua 2 so la 1200.Tim 2 so do .
2) So A chia cho 93 du 39,hoi A phai thay doi the nao de phep chia la phep chia het va thuong giam 2 don vi .
3) Tim 3 so co trung binh cong la 600 biet rang so thu ba gap 18 lan so thu nhat.Neu viet so thu nhat vao ben phai hay ben trai chinh no thi ta duoc so thu hai.
trung binh cong cua 3 so la 91. Tim 3 so do,biet so thu nhat gap doi so thu 2,so thu 2 gap doi so thu 3.
trung binh cong cua 3 so la 90 . Tim moi so ,biet 1/2 so thu nhat bang 1/3 so thu 2 , so thu ba gap hai lan so thu nhat
tim tich cua mot phep nhan biet, biet rang tich gap 8 lan thua so thu nhat va thua so thu nhat gap 6 lan thua so thu 2
trung binh cong cua ba so so thu nhat gap 3 lan so thu 2 so thu hai gap doi so thu nhat .tim ca 3 so
1) So A chia cho 93 du 39,hoi A phai thay doi the nao de phep chia la phep chia het va thuong giam 2 don vi.
2) Tim 3 so co trung binh cong la 600 biet rang so thu ba gap 18 lan so thu nhat . Neu viet them so thu nhat vao ben phai hay ben trai chinh no thi ta duoc so thu hai .
biet tong cua hai so la 64, neu gap so thu nhat len 6 lan va so thu hai gap 4 lan thi duoc tong moi la 356. Tim hieu hai so do?