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一次函式代表一條直線.直線和兩個座標軸分別交於一點,與X軸交點的橫座標的絕對值和Y軸交點的縱座標的絕對值相乘再乘以2分之一就出來了. 你令X等於0求出一個Y,再令Y等於0,求出一個X,這兩個值的絕對值相乘再乘以二分之一就行了.
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