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学进去-教育应平等而普惠
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难度系数:0.40
所属科目:小学英语
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Buying bags

Lanlan has got 50 yuan. She can buy a new bag now. This red bag is very nice. Wow, it costs 180 yuan. It’s too expensive. This yellow bag costs 20 yuan. It’s beautiful. And this blue bag costs 30 yuan. She can buy two bags.

(   ) 1. Lanlan has got 60 yuan. 
(   ) 2. The red bag is 20 yuan. 
(   ) 3. The blue bag is 20 yuan.
(   ) 4. The yellow bag is expensive. 
(   ) 5. Lanlan can buy two bags.
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优质答疑

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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