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(6)700x+7500=900x
-200x=-7500
x=37.5

(7)a(p+q)で求められる。
a=傾き(変化の割合)
p=xの増加量(小さい方)
q=xの増加量(大きい方)

この問題なら、
3(1+3)=12

ななみ

ありがとうございます‪⸜(*ˊᵕˋ*)⸝!

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