(1)在研究圆的面积和圆柱体积公式的推导过程中,我们都用到了哪些数学思想方法?
(2)通过观察拼成后的长方体与原来的圆柱有怎样的关系?得到了什么结论?
(3)请进一步观察图二,圆柱的高是10厘米,拼成近似的长方体,表面积增加了60平方厘米。圆柱的体积是多少立方厘米?(圆周率取3.14)
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