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Cam on F!
minh da tim duoc may do L, co dieu viec tim cac tai chuan la rat kho do do minh khong chon giai phap thay tai ma bang cach thay doi dien ap dau vao, giu nguyen tai de co duoc Kt. Con do minh dieu khien bang do rong xung nen thay doi dien ap dau vao thong qua do rong xung la dieu thuc hien duoc chinh xac hon. Cam on ban.
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