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