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. No, we aren't.          B. We often play games.       C. Yes, we do.
_____) 2. A. Yes, please.            B. It's sixty yuan.           C. I want to buy some apples.
_____) 3. A. We have two.           B. Sure.                   C. There are ten.
_____) 4. A. OK. Here you are.       B. It's ninety-five yuan.       C. They're twenty yuan.
_____) 5. A. We often sing.          B. We draw pictures.          C. We have science lessons.
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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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