学进去-教育应平等而普惠
试题
类型:口算和估算
难度系数:0.65
所属科目:小学数学
直接写出得数.
15-6=                      4+50=                      35+9=                  42-3=            
26+5=                      63-30=                    74-70=                  64-7=
4+38=                      20+57=                    46-8=                  58+8=
18-9=                      60-7=                      8+24=                  70+5=
20+40=                    80-60=                    40+52=                 64-17=
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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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