39×20≈ 40×22≈ 30×19≈
31×10≈ 20×41≈ 50×17≈
68×40≈ 68×72≈ 32×48≈
63×25≈ 67×24≈ 76×23≈
19×11≈ 90×83≈ 22×91≈
58×21≈ 66×92≈ 78×50≈
62×94≈ 57×53≈ 84×26≈
60×93≈ 43×29≈ 27×76≈
64×62≈ 13×83≈ 69×74≈
41×46≈ 91×91≈ 87×20≈
93×28≈ 54×93≈ 33×34≈
72×15≈ 13×49≈ 14×76≈

同类型试题

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


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

