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我们来看看 Sam 的饮食习惯.根据表格,回答问题.
How often does Sam eat…? | food | Time (s) a week |
bread | 7 | |
| chicken | 6 |
potatoes | 14 | |
apples | 3 |
1．What’s Sam’s favourite food?
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2．What food does he eat seven times a week?
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3．How often does he eat chicken?
__________________________________________
4．How often does he eat apples?
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5．What food does he need to eat more?
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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
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
