学进去-教育应平等而普惠
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难度系数:0.94
所属科目:小学英语
听录音,选择你所听到的内容。
(        ) 1. A. weekend                   B. yesterday                    C. holiday
(        ) 2. A. were                         B. are                            C. was
(        ) 3. A. clean                        B. cleaned                      C. stayed
(        ) 4. A. watch                       B. wash                         C. watched
(        ) 5. A. rode a bike                 B. had a cold                  C. read a book
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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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