
(1)请计算:最内圈的一条直跑道长是多少米?
(2)如果淘气与笑笑分别在第1条跑道和第2条跑道上进行200米赛跑,由于有弯道,为了公平,笑笑的起跑线应设在淘气起跑线前面多少米?
(3)现要在中间长方形足球场内铺草坪,在跑道上铺塑胶。已知铺草坪每平方米要花费50元,铺塑胶每平方米要花费400元,算一算,投入50万元够吗?

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

