(1)12×30=(____) (2)120×30=(____)(3)120×300=(______)
(4)240×300=(______) (5)120×3=(____)
一个因数 | 另一个因数 | 积 |
扩大10倍 | 不变 | (______) |
扩大10倍 | 扩大10倍 | (______) |
扩大20倍 | 扩大10倍 | (______) |
扩大10倍 | 缩小为 | (______) |
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