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- uses crt;
- var tuoicon, tuoicha, dem: byte;
- begin
- write('Nhap tuoi cha va tuoi con: ');
- readln(tuoicha, tuoicon);
- while (tuoicha - tuoicon < 25) or (tuoicha <= tuoicon * 2) do
- begin
- write('Nhap tuoi khong hop le! Nhap lai: ');
- readln(tuoicha, tuoicon);
- end;
- dem := 0;
- while (tuoicon + dem) * 2 < tuoicha + dem do
- dem := dem + 1;
- write('Sau ', dem,' nam thi tuoi cha bang 2 lan tuoi con');
- readln;
- end.
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