Các câu hỏi tương tự
lop 5a cuoi hoc ky 1 chi gom 3 loai hoc sinh gioi kha va trung binh so hoc sinh gioi bang 1/3 so hoc sinh cua lop .So hoc sinh kha it hon 3/5 so hoc sinh trung binh la 2 em.Tinh so hoc sinh gioi va kha cua lop biet so hoc sinh trung binh la 15 em
TBC 3 so la ̀50. Biet so thu nhat kem so thu hai 22 don vi va hon so thu ba 7 don vi. Tim 3 so do.
tim mot so co 4 chu so biet trung binh cong cua cac chu so la 3 va chu so hang nghin gap 3 lan chu so hang tram
Tim mot so co bon chu so . Biet rang trung binh cong cua các chu so la 3 va chu ao hang nghin gap ba lan chuxao hang tram
Tim so tu nhien co 3 chu so biet chu so o hang don vi la 7 .Neu chuyen chu so 7 o don vi len hang dau thi duoc so moi gap 2 lan so cu va cong them 21 don vi
so sanh: 2115 va 273. 498
tim so tu nhien co 3 chu so chia het cho 5 va 9 biet rang chu so hang chuc bang trung binh cong cua hai chu so kia.
A la tap hop stn co 2 chu so trong do chu so hang chuc be hon chu so hang don vi va tong 2 so bang 12 so phantu cua a la
trung binh cong cua ba chu so la 29 biet chu so thu hai gap doi chu so thu nhat con so thu ba lon hon so thu hai 7 don vi tim ba so do
tim so chia cua mot phep chia , biet rang : so bi chia 410, so du bang 19
a) tim mot so co hai chu so va neu lay so do chia cho chu so hang don vi thi duoc thuong la 8 va du 7
b) tong cua hai so bang 196 . tim hai so do
c)tim so co 3 chu so , biet rang neu viet them mot chu so 3 vao ben phai so do thi no tang them 2217 don vi