1.第一个长方形的周长是多少?列式是( )。
A.(8+5)×2=26(分米) |
B.(8+5-2)×2=22(分米) |
C.(8-2)×2=12(分米) |
D.(8+5)×2-2=24(分米) |
A.(8+5)×2=26(米) |
B.(8+5-2)×2=22(分米) |
C.(8-2)×2=12(米) |
D.(8+5)×2-2=24(分米) |
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