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dcphong2k
2 năm trước
Bài 1:Cho phương trình: x²+2 (m-1)x-(m+1)=0 a.Giải phương trình khi m=2 b. Tìm m để phương trình có 2 nghiệm x1,x2 . Tìm hệ thức liên hệ giữa x1,x2 không phụ thuộc m Bài 2:Cho 2 hàm số : y=2x-1 và y =-1/2x +4 . Tìm tọa độ giao điểm M của đồ thị 2 hàm số trên Bài 3:Cho phương trình : x²+(m+2)x+2m=0 (1) a. Chứng minh phương trình(1) luôn có 2 nghiệm x1,x2 với mọi m b. Tìm biểu thức liên hệ giữa x1,x2 không phụ thuộc m Bài 4:Cho hàm số :y =1/2x²(P) Tìm tung độ của điểm nằm trên (P) có hoành độ=8
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