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8×7= 9×8= 81÷9= 4×5=
45÷9= 8 + 4= 42-6= 2 + 4=
63÷7= 42÷7= 6×5= 18 +6=
16÷4= 3×5= 9÷1= 24÷8=
3×8-7= 4×6-4= 2×3×7= 32÷4÷2=
48÷6÷4= 4×2×7= 7×5+5= 3×9 + 4=
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
