國中 解答

三多登山協會會長想要瞭解會員年齡分布狀況,他以10歲為組距,在會員年齡的相對次數分配折線圖上 依序畫了兩個點,其座標分別是 (35 ,15)、(45 ,25),若已知50~60歲的會員有8人,會員共有40人,則第三點的座標為何?

解方程式(x+2)(2x-1)=(x+2)(x+9),得x=

若-4是一元二次方程式x2-3ax-28=0的一個解,而方程式的另一個解為b,則a+b =

下列哪一個一元二次方程式是沒有解的?

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