A.车轮滚动一周所行的路程是圆的周长 |
B.在3∶7中,比的前项增加9,要使比值不变,比的后项要扩大到原来的4倍 |
C.甲数的20%等于乙数的30%,那么甲数一定大于乙数(甲、乙两数均不为0) |
D.在边长是10cm的正方形中画一个最大的圆,圆的面积与正方形面积的比是4∶ |
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