学进去-教育应平等而普惠
试题
类型:口算和估算
难度系数:0.85
所属科目:小学数学
口算下面的题。
8-4=                       1+7=                      10-3=                       2+5=
3+6=                       8+10=                    15-4=                       2+9=
9-5=                       6+6=                      7-6=                         19-19=
8+9=                       4+6=                      12+0=                       6-2=
13-10=                    9+7=                      5+8=                         7+9=
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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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