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請問後面兩個試子有問題嗎?這是簡單的2遠一次方程組問題! 單前面2個方程,都有個2X,第一個方程可化簡為2X=7+Y,帶入第二個方程求出Y=-1.5,因為2X等於7+y(Y已經知道)所以X=2.75
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