Tuyển HSG Tam Hiệp

De Thi Tuyen Hsg Lop 9 Thi Xa Tam Diep Ninh Binh BAI 1 phan tich da thuc thanh nhan tu a) +4 -7x-10 b) + +1 BAI 2 Rut gon 3)chung minh a)( + +1) ( -x-1) n+2 6 b)Neu -x+1=0 thi voi moi so tu nhien n co : x^(6n+1)+ =x^(6n-1)+ =1 x^(6n+2)+ =x^(6n-2)+ =1 co luu y gi ve x^2-x+1=0 c)(x+a)(x+2a)(x+3a)(x+4a)+ la binh phuong cua mot tam thuc bac hai cua x bai 4 tim nghiem nguyen x^2 - 6xy+13 =100 bai 5 cho diem M trong tam giac ABC cac duong thang MA,MB,MC cat AB,AC,AB tai I,H,K a) Ke cac duong AQ BC,MR BC.hay lap ti so giua dien tich ABC va MBC theo MA va MI b)chung minh rang 3 ti so , , khong dong thoi lon hon 2 cung khong dong thoi nho hon 2 c)tim vi tri cua M de 3 ti so do bang nhau . De Thi Tuyen Hsg Lop 9 Thi Xa Tam Diep Ninh Binh BAI 1 phan tich da thuc thanh nhan tu a) +4 -7x-10. c)(x+a)(x+2a)(x+3a)(x+4a)+ la binh phuong cua mot tam thuc bac hai cua x bai 4 tim nghiem nguyen x^2 - 6xy+13 =100 bai 5 cho diem M trong tam giac ABC cac duong thang MA,MB,MC