請問怎麼列式第26題?

2020-09-23 12:55 pm

回答 (1)

2020-09-23 1:46 pm
(a)
y = 3400 - [(3400-400)/15]t
  = 3400 - 200t
  = -200t + 3400, 0 ≦ t ≦ 15

(b)
t = 8, 則
y = -200 × 8 + 3400 = 1800(元)


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