7.
假設甲 = (3x - 2)、乙 = x
8.
假設 a = a, b = (a + 2)
a + b + c = 60
c = 60 - a - b = 60 - a - (a + 2) = (58 - 2a)
9.
假設 P 點座標為 x
7.
假設甲 = (3x - 2)、乙 = x
8.
假設 a = a, b = (a + 2)
a + b + c = 60
c = 60 - a - b = 60 - a - (a + 2) = (58 - 2a)
9.
假設 P 點座標為 x
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