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. It’s five yuan.              B. They are six dollars.
(      ) 2. A. He is cleaning the floor.        B. He is at school.
(      ) 3. A. Yes, they are.              B. Yes, I will.
(      ) 4. A. We are going to have a picnic.        B. I am walking in the park.
(      ) 5. A. Two colas, please.              B. It’s $ 4.50.
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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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