public void XoaPhanSo(PhanSo ps)
{
this.GanTuSo(0);
this.GanMauSo(0);
ps.GanTuSo(0);
ps.GanMauSo(0);
}
public void QuyDongMau(PhanSo ps)
{
int MauSoChung = this.mMauSoChung(ps);
PhanSo ps1m = new PhanSo();
PhanSo ps2m = new PhanSo();
ps2m.GanMauSo(MauSoChung);
ps1m.GanMauSo(MauSoChung);
ps1m.GanTuSo(this.LayTuSo() * ps.LayMauSo());
ps2m.GanTuSo(ps.LayTuSo() * this.LayMauSo());
ps1m.xuatPhanSo();
ps2m.xuatPhanSo();
}