Cho hình chữ nhật ABCD có AB = a, AC = 2a. Hãy tính góc giữa hai vecto (overrightarrow {CA} ) và (overrightarrow {DC} .) 

Câu hỏi: Cho hình chữ nhật ABCD có AB = a, AC = 2a. Tính góc giữa hai vecto (overrightarrow {CA} ) và (overrightarrow {DC} .)  Lời giải tham khảo: Đáp án đúng: A Ta có: ABCD là hình chữ nhật nên ta có: AB = DC = a. (begin{array}{l}angle left( {overrightarrow {CA} ,,,overrightarrow {DC} } right) = […]

Technology is Taiwan’s security guarantee: Tsai – LLODO

By Lin Chia-nan / Staff reporter, in Tainan and Kaohsiung Technology is the nation’s security guarantee, President Tsai Ing-wen (蔡英文) said yesterday, expressing the hope to make the world “more reliant on Taiwan.” Tsai made the remarks during visits to the Ministry of Science and Technology’s Cyber Security and Smart Technology R&D Building in Tainan […]

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