三、 計算題：
1. 已知 的解為 x＝y＝－1，求 a 與 b 的值。

編輯私有筆記及自訂標籤國一數學下第一次-108 年 - 2019彰化縣縣立埔心國中七年級108 下學期數學第一次段考(期中考)康軒#92708
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點擊查看答案 參考答案 答案：C 難度：適中0.694656 統計：A(23),B(86),C(546),D(102),E(0) 關閉 內容推薦 投籃比賽中，參賽者在限定時間內能隨意投 2分球或 3分球。今多多代表班上參加比賽，裁判跟他說：「總共投進 15顆球，得 36分。」，則多多共投進幾顆 3分球？(A) 3 (B) 6 (C) 9 解二元一次聯立方程式 時，下列哪一個步驟可以消去未知數 y？(A)① ×4－②×3 (B)①×4＋②×3 (C)①×3＋②×2 (D)①×3－②×2 若 x＝y＝2 是 ax－b y =12 的一組解，則 15a－10b＋12=？(A) 24 (B) 37 (C) 60 (D) 72 多多和大大一起到早餐店，多多買了 3 個包子和 7 個饅頭共付 66 元，大大買了 7 個包子和 3 個饅頭共花了 74 元，試問一個包子比一個饅頭貴多少元？(A) 2 (B) 3 (C) 4 黃金和二哈現在的年齡分別是 x、y 歲，且 x、y 的關係式為 3(x＋2)＝y，請問下列敘述何者正確？(A) 兩年後，二哈的年齡是黃金年齡的 3 倍(B) 黃金現在年齡是二哈兩年後的 3 倍( 下列何者為二元一次方程式？(A) 3x＋2y＋32 ＝10 (B) 3x＋2 y＋3＝3(x＋y)－7 (C) 3x＋2y＋3 (D) 3x2 ＋2y＋3＝10 六個數由小排到大，已知六數之平均數為 25，若前二數之平均數為 12，後二數之平均數為 35，則中位數為何？(A) 28 (B) 29 (C) 30 (D) 31 珍珠班上有九位同學，他們的體重資料如下： 58，54，47，41，49，48，45，47，52。(單位：公斤)關於此資料的中位數與眾數的敘述，下列何者正確？(A) 中位數為 49 (B) 平均數 下列敘述何者正確？(A)若a＞b，則｜a｜＞｜b｜ (B)若ac＞bc，則a＞b(C)若｜a｜＜｜b｜，則a2＜b2(D)若a＞b，則－a＞－b 下列敘述何者錯誤？(A)有4筆資料，其數值分別為4，則中位數是5 (B)一組資料有9筆數值，則中位數是由小到大排列的第5筆資料 (C)一組資料中，最大的數值稱為眾數 (D)中位數的值 內容推薦 Grace and her sisters like playing badminton , and ______ Alice. They always playbadminton toget 19 John：Can I have a glass of water? I’m thirsty because I just ran twenty miles. Gina：Sure. Here __ Ms. Lin：Students have to take the math test today. But it is not hard. They can do wellon the te Stanley has twin sisters. ______ has long hair, and ______ has short hair.(A) One; another (B) A Eric dreamed of ______ a doctor when he was little. He studied hard and never gave______. Now, h The math test is difficult. Jane didn’t do well on it, and ______ Alex. He is not good atmath, _ The teacher asked the students ______ and be careful ______ the works of art in themuseum.(A) no Danny：I called your sister, Lily, last night, but she didn’t answer. Was she studying? Amy：No, s The old building was a library, but it is empty(空的) now. The building has a long history.It ____ The light was on. Bonnie asked her husband to turn ______ before he left the house, buther husba Mom：Here’s your coat. ______ Son：But the sun is shining brightly outside. Mom：Better safe than s But since he changed jobs, he has been too busy to do that.(A) Working hard is in Mike’s blood. Frank：Did you know that Peter had quit(辭掉) his job? Peggy：Yes, I did. Frank：No wonder. The last 【題組】(A) and others were his tests (B) but another was his studying(C) and the other was his repo 【題組】(A) some (B) others (C) another (D) the others 【題組】(A) dreams of (B) cares about (C) waits for (D) picks up 【題組】(A) I worry about him (B) I’ll pick him up from school(C) He passed on the news (D) He can’t 【題組】What do we learn about the writer from the chart?   (A) Most of his phone use is for emailin 【題組】Jenny is a junior high school student. She needs to go to school on weekdays from7:40a.m. to 【題組】What can we know from the reading?(A) One of the volunteer jobs is to clean up the beach in Peter didn’t take Joe’s cellphone on p        e. That’s because their cellphones look the same.編輯 坐標平面上，方程式 x＝－8 的圖形是一條平行 y 軸的直線。(A)O(B)X 坐標平面上，方程式 x＋2y＝0 的圖形是一條通過原點的直線。(A)O(B)X 若 5x＝3y，且 x、y 皆不為 0，則 x：y＝3：5。(A)O(B)X 若 x：y＝2：3，則 x＝y＝3。(A)O(B)X