I.TRẮC NGHIỆM 1/Cho a ϵ Z, các so sánh nào sau đây sai ? A. a > -a (a > 0) B. –a < 0 (a > 0) C. ( -a)2 = a2 D. –a = a 2/Tổng tất cả các ước nguyên âm của 9 là : A.-13 B.0 C. – 4 D.- 10 3/Tìm x ϵ N, biết x.x3 = 36 : 32 A. x= 1 B. x= 6 C. x= 3 D. x= 9 4/Kết quả của phép tính : [504 – (52.8 + 70) : 32 + 6] : 120 là : A. 4 B. – 4 C.3 D. – 3 5/ Câu nào sau đây đúng ? A.Số chia hết cho 2 luôn luôn là hợp số . B.Số 0 là ước của mọi số nguyên . C. Số 1 là bội của mọi số nguyên . D.Tích của ba số nguyên âm là một số nguyên âm. 6/ Cho đoạn thẳng AB = 7cm. Vẽ các điểm C và D thuộc đoạn thẳng AB sao cho AC = 4,5cm ; BD = 6cm. Độ dài đoạn thẳng CD là : A. 1,5cm B. 2,5cm C. 3,5cm D. 4,5cm 7/ Trên tia Ax lấy hai điểm B và C sao cho AB = 8cm , AC = 4cm . Câu nào sau đây sai ? A. AC và AB là hai tia có chung gốc. B. CA và CB là hai tia đối nhau. C. AB + BC = AC. D.C là trung điểm AB. 8/ Cho hai tia ox , oy đối nhau lấy A thuộc ox, B thuộc oy sao cho OA = OB = 3cm .Câu nào sau đây đúng ? A.OA + OB = AB B.O là trung điểm AB C. AB = 6cm C. Cả A, B, C đúng . 9/ Trong hình vẽ sau có bao nhiêu tam giác ? A. 3 B. 4 C. 5 D. 6 10/ Cùng hình ở câu 9/ có bao nhiêu góc ? A. 4 B. 5 C. 6 D. 12 trả lời giúp mình vs ạ gấp lắm xin cảm ơn

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