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
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(     ) 1.A. I often do my homework. B. I like spring best.       C. I’ m shopping now.
(     ) 2. A. June 1st.             B. August 1st.       C. October 1st.
(     ) 3. A. Sunny.             B. Friday.             C. Winter.
(     ) 4. A. Yes, of course.       B. Here you are.       C. He is eating.
(     ) 5.A. I can play in the snow.       B. I’m reading a book.       C. I like singing.
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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

用户名称
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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