45×10= 23×20= 44×10= 15×30= 43×30= 17×30=
66×10= 24×20= 45×20= 55×20= 11×20= 70×20=
40×30= 30×21= 30×13= 60×20= 40×12= 11×50=
25×10= 12×40= 20×60= 40×70= 35×20= 16×40=
11×60= 18×50= 46×10= 32×20= 41×20= 70×80=
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