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Cho biết hai đại lượng x và y tỉ lệ nghịch với nhau và khi x = 2 thì y = -4 , ta có hệ số tỉ lệ k là: A. k = -2 B. k = 2 C.k = 8 D. k = -8 Câu 7: Điểm nào sau đây thuộc đồ thị của hàm số y = 2x A. A( 12 ;1) B. B(-1;2) C. C(4; 12 ) D. D(0;2) Câu 8: Từ tỉ lệ thức a b = c d có thể suy ra: A. db ac = B. dc ab = C. da cb = D. bd ac = Câu 9: Cho Δ ABC biết Aˆ = 500; Bˆ = 600.Số đo góc ngoài tại đỉnh C của Δ ABC là: A. 700 B. 1100 C. 100 D. 900 Câu 10: Tam giác ABC bằng tam giác PQM. Biết AB = QP; BC = QM. Ký hiệu sự bằng nhau của hai tam giác trên được viết đúng là: A. Δ ABC = Δ PQM B. Δ ABC = Δ QMP C. Δ ABC = Δ QPM D. Δ ABC = Δ MQP Câu 11: Trong một tam giác vuông hai góc nhọn: A. bù nhau B. bằng nhau C. phụ nhau D. kề bù Câu 12: Hai tam giác có điều kiện nào sau đây thì bằng nhau: A. Hai cạnh và một góc bằng nhau. B. Hai góc và một cạnh bằng nhau. C. Ba cạnh bằng nhau. D. Cả A, B, C câu trên đều đúng. Câu 13. Độ dài hai cạnh góc vuông của một tam giác vuông lần lượt là 3cm và 4cm thì độ dài cạnh huyền là : A.5cm. B. 7cm. C. 6cm D. 14cm.Câu 14. Nếu tam giác ABC cân và có A! = 600 , thì tam giác ABC là: A. Tam giác nhọn. B. Tam giác đều. C. Tam giác vuông. D. Tam giác tù
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