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daudaihoca5
2 năm trước
Bài 1 : cho 3 điểm A(2,1) , B(-1,-2) , C(0,-1) a)viết phương trình đường thẳng AB b)chứng minh 3 điểm trên thẳng hàng Bài 2 : cho f(x)=X ∧2+bx+c. Tìm b,c biết f(1)=2;f-(3)=0 Bài 3 : Trên cung nhỏ AB của (O), cho 2 điểm C và D sao cho cung AB được chia thành 3 cung bằng nhau(AC=CD=DB). a)hãy so sánh các đoạn thẳng AE và FB b)AB song song với CD (Có ai làm được không chỉ cho mình với ạ)
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