30×500= 90×0= 25×8= 300÷5= 10×12=
8000÷8= 420÷7= 0÷25= 3600÷9= 5400÷6=
900×7= 22×40= 200×40= 1.1﹣0.3= 4.5+2.3=
6.2+3.9= 125÷2≈ 161÷2≈ 239÷6≈ 137÷7≈
23×22≈ 59×20≈ 61×80≈ 42×58≈
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