Giải bài tập 3.40 trang 73 SGK Toán 9 tập 1 - Cùng khám phá

Xét phát biểu I: “Nếu a và b là hai số không âm bất kì thì \(\sqrt {a.b} = \sqrt a .\sqrt b \)” và phát biểu II: “Nếu a và b là hai số không âm bất kì thì \(\sqrt {a + b} = \sqrt a + \sqrt b \)” Trong các khẳng định sau, khẳng định nào là đúng? A. Cả hai phát biểu I và II đều đúng. B. Cả hai phát biểu I và II đều sai. C. Phát biểu I đúng và phát biểu II sai. D. Phát biểu I sai và phát biểu II đúng.

Tổng hợp Đề thi vào 10 có đáp án và lời giải

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Đề bài

Phương pháp giải - Xem chi tiết

Nếu a và b là hai số không âm bất kì thì \(\sqrt {a.b} = \sqrt a .\sqrt b \).

Lời giải chi tiết

Ta có: Nếu a và b là hai số không âm bất kì thì \(\sqrt {a.b} = \sqrt a .\sqrt b \). Vì \(\sqrt {2 + 3} \ne \sqrt 2 + \sqrt 3 \) nên phát biểu II: “Nếu a và b là hai số không âm bất kì thì \(\sqrt {a + b} = \sqrt a + \sqrt b \)” sai. Do đó, phát biểu I đúng và phát biểu II sai. Chọn C

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4.9 trên 7 phiếu

ܫ Giải bài tập 3.41 trang 73 SGK Toán 9 tập 1 - Cùng khám phá Thứ tự từ nhỏ đến lớn của các số \(5\sqrt 8 ,\;8\sqrt 5 ,\;7\sqrt 6 \) là A. \(5\sqrt 8 ,\;8\sqrt 5 ,\;7\sqrt 6 \). B. \(5\sqrt 8 ,\;7\sqrt 6 ,\;8\sqrt 5 \). C. \(8\sqrt 5 ,\;7\sqrt 6 ,\;5\sqrt 8 \). D. \(7\sqrt 6 ,\;5\sqrt 8 ,\;8\sqrt 5 \).
💃 Giải bài tập 3.42 trang 73 SGK Toán 9 tập 1 - Cùng khám phá \(\sqrt {\frac{{36}}{x}} - \sqrt {\frac{{25}}{x}} = \frac{1}{4}\) khi x bằng A. 1. B. 4. C. 9. D. 16.
🤪 Giải bài tập 3.43 trang 73 SGK Toán 9 tập 1 - Cùng khám phá Giá trị của biểu thức \(\frac{1}{{3 + \sqrt 5 }} + \frac{1}{{3 - \sqrt 5 }}\) là A. \(\frac{3}{2}\). B. \(\frac{1}{3}\). C. \(\frac{1}{6}\). D. \(\frac{1}{2}\).
ও Giải bài tập 3.44 trang 73 SGK Toán 9 tập 1 - Cùng khám phá Rút gọn biểu thức \(A = \left( {\frac{{\sqrt {14} - \sqrt 7 }}{{1 - \sqrt 2 }} + \frac{{\sqrt {15} - \sqrt 5 }}{{1 - \sqrt 3 }}} \right)\left( {\sqrt 7 - \sqrt 5 } \right)\), ta thu được giá trị của A là A. \( - 2\). B. 2. C. \( - 1\). D. 1.
😼 Giải bài tập 3.45 trang 73 SGK Toán 9 tập 1 - Cùng khám phá Biểu thức \(\sqrt[3]{{a + 2}} + \sqrt[3]{{6a - 9}}\) có giá trị bằng 5 khi A. \(a = - 1\). B. \(a = 6\). C. \(a = - 6\). D. \(a = 1\).

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Tham Gia Group Dành Cho Lớp 9 - Ôn Thi Vào Lớp 10 Miễn Phí

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