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. PE.             B. Music.       C. Art.
(     ) 2. A. Forty.             B. Forty-two.       C. Eighty-two.
(     ) 3. A. She has a black dog.       B. She has a black cat.       C. She has a white cat.
(     ) 4. A. Mike does.       B. Helen does.       C. Yang Ling does.
(     ) 5. A. Yes, she can.       B. No, she can’t.        C. Yes, she does.
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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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