学进去-教育应平等而普惠
试题
类型:单选题
难度系数:0.65
所属科目:初中英语
Li Wei bought some school things online at the beginning of the new term, according to the information in the form below, he saved _______ in all.
School things




The shop nearby
¥ 160
¥ 30
¥ 20
¥ 80
Online shop
¥ 140
¥ 20
¥ 15
¥ 60
 
A.¥ 55B.¥ 235C.¥ 290
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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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