※ 引述《s1990716 (小婷)》之銘言：
: A(square)baseball diamond has sides that are 90 feet along. A player 26 feet
: from third base is running at a speed of 30 feet per second. At what rate is
: the player's distance from home plate changing ?
: 不清楚要怎麼設式呢......
: 請幫忙解惑~
A到本壘板 = L A到三壘 = S = 26
L^2+(22.5)^2=S^2
dL S dS
-- = ----2-----2-- -- ≒ 60 dS/dt=30
dt √(S -22.5 ) dt
一般這種題目數字都會設計漂亮一點 這題真醜 ^^"
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