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试题
类型:口算和估算
难度系数:0.65
所属科目:小学数学
直接写出得数.
7×9=            4×8=            6×3=                       4×8-16=
2×2=          5×3=               6×5=                       8×7=
4×4=             7×6=               9×3=                       9×8=
2×5=            6×4=            1×1=                       4×3+4=
3×9=             5×1=        3×3=                       8×7-6=
3×2=          4×6=        9×7=                       3×8+5=
8×9=               6×7=          5×4=                       9×7-7=
5×7=          7×8=          5×8=                       6×9+9=
3×6=            4×3=            7×4=                       5×2=
3×1=             2×1=          7×7=                       4×2+3=
6×8=               2×9=             4×9=                       3×8-2=
8×1=               5×6=             9×7=                       2×5+8=
7×3=        2×6=        7×5=                       6×9-7=
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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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