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yhn92 · 7 Tháng tư 2013

1. Trong m[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ặ[/FONT][/FONT]t ph[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ẳ[/FONT][/FONT]ng t[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ọ[/FONT][/FONT]a [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]độ [/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]Oxy[/FONT][/FONT], cho [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]đ[/FONT][/FONT]i[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ể[/FONT][/FONT]m [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]A[/FONT][/FONT](0; 2) và Δ là [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]đườ[/FONT][/FONT]ng th[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ẳ[/FONT][/FONT]ng [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]đ[/FONT][/FONT]i qua [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]O[/FONT][/FONT]. G[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ọ[/FONT][/FONT]i [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]H [/FONT][/FONT]là hình chi[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ế[/FONT][/FONT]u vuông góc c[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ủ[/FONT][/FONT]a [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]A [/FONT][/FONT]trên Δ. Vi[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ế[/FONT][/FONT]t ph[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ươ[/FONT][/FONT]ng trình [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]đườ[/FONT][/FONT]ng th[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ẳ[/FONT][/FONT]ng Δ, bi[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ế[/FONT][/FONT]t kho[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ả[/FONT][/FONT]ng cách t[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ừ [/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]H [/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]đế[/FONT][/FONT]n tr[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ụ[/FONT][/FONT]c hoành b[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]ằ[/FONT][/FONT]ng [FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]AH[/FONT][/FONT].

hiepsh97 · 8 Tháng tư 2013

Gọi tọa độ H(a,b)

=> $\vec{HA}=(-a,2-b)$ và $\vec{HO}=(-a,-b)$

Do AH vuông góc HO => $\vec{HA}.\vec{HO}=0$ => đc 1 pt

Theo bài ra $ d(AH,Ox)=|b| = AH = \sqrt{a^2+(b-2)^2}$ => đc 1 pt nữa

Giải hệ 2 pt => H => $\Delta $

Arressavopups · 8 Tháng tư 2013

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