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増加量42→f(t+6)>f(t)
→ f(t+6)-f(t)=42→二次方程式を解く

G

f(t+6)-f(t)=3/4(t+6)^2-3/4t^2=yの増加量=42
→t=5/3(分母3分子5)

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わかりました!ありがとうございます!

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