tim so tu nhien co 2 chu so biet rang so do hon 7 lan tong cac chu so cua no la 6 don vi
tim 1 so tu nhien co 2 chu so biet rang so do lon hon tong cac chu so cua no la 5 don vi
Tim so tu nhien co 2 chu so biet rang chu so hang chuc lon hon chu so hang don vi la 2 va so do lon hon tong cac binh phuong cac chu so cua no la 1.
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 tat ca cac so tu nhien có 2 chu so biet rang chu so hang don vi nho hon chu so hang chuc la 2 va tich cua chu so do cua no luon lon hon tong cua hai chu so cua nó la 34 don vi
Tim so tu nhien co 2 chu so biet rang
a. So do gap 6 lan tong cac chu so cua no
b. So do gap 7 lan tong cac chu so cua no
c. So do gap 8 lan tong cac chu so cua no
d. So do gap 9 lan tong cac chu so cua no
tim cac so co 2 chu so biet so do gap 7 lan tong cac chu so cua no la 6 don vi
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 tu nhien co hai chu so,biet rang so do lon gap 6 lan tong cac chu so cua no
Gọi số cần tìm là ab ( a khác 0 )
Ta có : ( a+b ) x 6 = ab
a x 6 + b x 6 = a x 10 + b
Bớt mỗi vế đi 6 lần a và 1 lần b
b x 5 = a x 4
=> a = 5 ; b = 4
vậy số đó là 54
tim so tu nhien co 3 chu so biet rang so do gap 10 lan tong cac chuso cua no la 80