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thangkoolkute
2 năm trước
Khi đun nóng một khối chất lỏng thì đại lượng nào sẽ thay đổi, đại lượng nào không thay đổi? A. thay đổi: thể tích, khối lượng, khối lượng riêng; không thay đổi: trọng lượng, trọng lượng riêng B. thay đổi: thể tích, khối lượng riêng; trọng lượng riêng; không thay đổi: trọng lượng, khối lượng C. thay đổi: thể tích, trọng lượng, khối lượng riêng, trọng lượng riêng; không thay đổi: khối lượng D. thay đổi: trọng lượng, khối lượng riêng, trọng lượng riêng; không thay đổi: thể tích, khối lượng
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Câu 1: Bộ ba số nào sau đây có thể là độ dài ba cạnh của một tam giác vuông? A. 3cm; 2cm; 5cm; B. 8cm; 6cm; 10cm; C. 4cm; 9cm; 12cm ; D. 3cm; 9cm; 14cm; Câu 2: Cho tam giác MNP có Nˆ = 680 , Pˆ = 400 . Khi đó so sánh các cạnh từ lớn đến bé là: A. NP > MN > MP; B. MN < MP < NP; C. NP < MP < MN; D. MP > NP > MN Câu 3: Cho tam giác ABC có Â = 500 , Bˆ = 350 . Cạnh lớn nhất của tam giác ABC là: A. cạnh AB B. cạnh BC C. cạnh AC D. cạnh CB Câu 4: Cho tam giác ABC có AB = 6cm, BC = 8cm, AC = 5cm. Khẳng định nào sau đây là đúng. A. Â < Bˆ <Cˆ ; B. Bˆ > Â >Cˆ C. Â < Cˆ < Bˆ D. Â > Cˆ > Bˆ . Câu 5: Cho ABC vuông tại B có AB = 3cm, AC = 5cm, BC = 4cm. Khi đó ta có: A. Â < Bˆ < Cˆ ; B. Cˆ < Bˆ < Â C. Â < Cˆ < Bˆ D. Cˆ < Â < Bˆ . Câu 6: Cho ABC có Â > 900 và Bˆ > Cˆ . Khẳng định nào sau đây là đúng. A. AB > AC > BC B. AC > AB > BC C. BC > AC > AB. D. BC > AB >

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