(1)如果在阴影部分铺塑胶跑道,每平方米100元,则一共花多少钱?
(2)笑笑和淘气分别从A、B出发,沿半圆跑到C、D,笑笑跑内圈,淘气跑外圈,两人跑过的路程差是多少米?
(3)笑笑和淘气同时从内道的相同起点进行同向跑步,淘气的速度是笑笑的120%,从起点出发后淘气第一次追上笑笑需要5分钟,那么笑笑的速度是多少?
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