Gọi số cần tìm là ab
nếu viết thêm chữ số 2 vào bên trái số đó thì ta có số 2ab
Theo đề bài ta có:
ab x 5 = 2ab
ab x 5 = 200 + ab
ab x 4 = 200(bớt mỗi vế đi ab)
ab =200:4
ab = 50
vậy số cần tìm là:50
gọi số đó là ab ; nếu viết thêm chữ số 2 vào bên trái số đó ta được 2ab
theo bài ra ta có :
ab x 5 = 2ab
ab x 5 = 200 + ab
ab x 4 = 200
ab = 200 : 4
ab = 50
vậy số đó là 50
50 là đúng 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
50 la dung 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
50 đúng 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
tin toi đi
