学进去-教育应平等而普惠
试题
类型:解答题
难度系数:0.85
所属科目:小学数学
观察下列乘法算式,你有什么发现?

                                       


3×1=3             6×1=6             5×1=5             8×1=8
3×2=6             6×2=12             5×2=10             8×2=16
3×3=9             6×3=18               5×3=15             8×3=24
3×4=12             6×4=24             5×4=20             8×4=32
3×5=15             6×5=30             5×5=25             8×5=40
3×6=18             6×6=36             5×6=30             8×6=48
3×7=21             6×7=42             5×7=35             8×7=56
3×8=24             6×8=48             5×8=40             8×8=64
3×9=27             6×9=54             5×9=45             8×9=72
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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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