学进去-教育应平等而普惠
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难度系数:0.65
所属科目:小学英语
听录音,选择相应的答语,将其序号填入题前括号里。
(      ) 1. A. I clean the blackboard.          B. I'm cleaning the blackboard.              C. I cleaned the blackboard.
(      ) 2. A. Yes, he did.                       B. No, he doesn't.                                 C. Yes, he is.
(      ) 3. A. We never watch TV.            B. We sometimes play football.               C. We often play football.
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y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

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2019-09-19

y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2

用户名称
2019-09-19
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