学进去-教育应平等而普惠
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类型:任务型阅读
难度系数:0.65
所属科目:小学英语

Christmas is coming! It’s a Western holiday. It’s 1. twenty-fifth. At Christmas, people don’t work. Children don’t go to school. They have Christmas 2., lights and Santa. 3. is a merry man in red clothes. Children say he brings gifts on Christmas. They invite their family and friends to their houses. “Merry Christmas!” they say. They 4. their family and friends gifts. They sing 5.. They have fun together.

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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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