学进去-教育应平等而普惠
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类型:听音,选择正确答案
难度系数:0.85
所属科目:小学英语
听录音,选择正确的应答。
(     ) 1. A. Tea.                       B. Coffee.                      C. Cola.
(     ) 2. A. She’s a doctor.          B. He’s a policeman.       C. I’m a student.
(     ) 3. A. He likes running.       B. He likes PE and Art.   C. He likes apples.
(     ) 4. A. Yes, she can.            B. She has a parrot.          C. No, she doesn’t.
(     ) 5. A. Eat turkeys.             B. Eat moon cakes.          C. Eat dumplings.
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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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