A.12.5 × 2.5 × 3.2 = 12.5 × 0.8 + 2.5 × 4 = 10 + 10 = 20 |
B.12.5 × 2.5 × 3.2 = (12.5 × 0.8) × (2.5 × 4) = 10 × 10 = 100 |
C.12.5 × 2.5 × 3.2 = (12.5 × 3.2) × (2.5 × 3.2) = 40 × 8 = 320 |
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