…………………………………………………………………………………………+ D?ng toán two.2 Vi?t ph??ng trình ???ng th?ng ?i qua m?t ?i?m vuông góc ho?c song tune v?i ???ng th?ng cho tr??c.T?t C?Th? D?c L?p tenth? D?c L?p eleventh? D?c L?p twelfth? D?c L?p sixth? D?c L?p 7Th? D?c L?p 8Th? D?c L?p nineH?