1.2×0.3÷5 = = | 1.2×(0.3÷5) = = |
3.1×(2.4÷0.8) = = | 3.1×2.4÷0.8 = = |
2×(5.7÷0.19) = = | 2×5.7÷0.19 = = |
(2)你发现了什么规律?写一写。
(3)运用你发现的规律写一个与9.8×4.75÷1.325结果相等的算式。
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