gọi số đó là ab
Theo bài ra at có: 3ab=5 x ab
=>300+ab=5 x ab
=>5 x ab-ab=300
=>4 x ab=300=>ab=300:4
=>ab=75
Vậy số cần tìm là 75
tim mot so co hai chu so biet rang neu viet them chu so 3 vao ben trai so do ta duoc so moi [co 3 chu so } = 5 lan so phai tim
tim so co ba chu so biet rang neu viet them chu so 1 vao ben phai so do thi ta duoc mot so gap 3 lan so co duoc bang cach viet them chu so 2 vao ben trai so do
tim 1 so co 2 chu so biet rang neu viet them chu so 3 vao ben trai so do ta duoc so moi bang 5 lan sô phai tim
tim mot so co ba chu so biet rang neu viet them chu so 5 vao ben trai so do thi ta duoc so moi ma tong cua so moi va so da cho bang 5472. so phai tim la......
tim mot so tu nhien co hai chu so biet neu viet them mot chu so 0 vao ben phai va mot chu so 1 vao ben trai so do thi ta duoc so moi bang 50 la so phai tim
tim 1 so co 2 chu so biet rang neu viet them vao ben trai ben phai so do 1 chu so 5 ta duoc 1 so moi co 4 chu so gap 75 lan so phai tim
tim 1 so tu nhien co 3 chu so, biet rang neu viet them chu so 3 vao ben trai so do ta duoc so moi bang 9 lan so phai tim?
so do la:............................................................................................
Tim so co 3 chu so ,biet rang neu viet them chu so 2 vao ben trai so do thi ta duoc so moi bang 17 lan so phai tim
Tra loi : So do la..........
tim mot so tu nhien co hgaichu so biet,neu viet them mot chu so 0 vao ben phai va mot chu so 1 vao ben trai so do thi ta duoc mot so moi bang 50 lan so phai tim
