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2025年世超金典暑假乐园暑假七年级数学人教版
注：目前有些书本章节名称可能整理的还不是很完善，但都是按照顺序排列的，请同学们按照顺序仔细查找。练习册 2025年世超金典暑假乐园暑假七年级数学人教版 答案主要是用来给同学们做完题方便对答案用的，请勿直接抄袭。
1. 下列方程组中不是二元一次方程组的是 (
A.$\left\{\begin{array}{l} x= 2,\\ y= 3\end{array} \right.$
B.$\left\{\begin{array}{l} x+y= 1,\\ x-y= 2\end{array} \right.$
C.$\left\{\begin{array}{l} x+y= 5,\\ xy= 1\end{array} \right.$
D.$\left\{\begin{array}{l} y= x,\\ x-2y= 1\end{array} \right.$
C
)A.$\left\{\begin{array}{l} x= 2,\\ y= 3\end{array} \right.$
B.$\left\{\begin{array}{l} x+y= 1,\\ x-y= 2\end{array} \right.$
C.$\left\{\begin{array}{l} x+y= 5,\\ xy= 1\end{array} \right.$
D.$\left\{\begin{array}{l} y= x,\\ x-2y= 1\end{array} \right.$
答案：
C
2. 已知$\left\{\begin{array}{l} x= 4,\\ y= -2\end{array} \right. 与\left\{\begin{array}{l} x= -2,\\ y= -5\end{array} \right. 都是二元一次方程y= kx+b$的解,则k与b的值分别为 (
A.$\left\{\begin{array}{l} k= \frac {1}{2},\\ b= 4\end{array} \right.$
B.$\left\{\begin{array}{l} k= \frac {1}{2},\\ b= -4\end{array} \right.$
C.$\left\{\begin{array}{l} k= -\frac {1}{2},\\ b= 4\end{array} \right.$
D.$\left\{\begin{array}{l} k= -\frac {1}{2},\\ b= -4\end{array} \right.$
B
)A.$\left\{\begin{array}{l} k= \frac {1}{2},\\ b= 4\end{array} \right.$
B.$\left\{\begin{array}{l} k= \frac {1}{2},\\ b= -4\end{array} \right.$
C.$\left\{\begin{array}{l} k= -\frac {1}{2},\\ b= 4\end{array} \right.$
D.$\left\{\begin{array}{l} k= -\frac {1}{2},\\ b= -4\end{array} \right.$
答案：
B
3. 某校运动员分组训练,若每组7人,则余3人;若每组8人,则缺5人.设运动员人数为x人,组数为y组,则列方程组为 (
A.$\left\{\begin{array}{l} 7y= x+3,\\ 8y+5= x\end{array} \right.$
B.$\left\{\begin{array}{l} 7y= x+3,\\ 8y-5= x\end{array} \right.$
C.$\left\{\begin{array}{l} 7y= x-3,\\ 8y= x+5\end{array} \right.$
D.$\left\{\begin{array}{l} 7y= x-3,\\ 8y= x-5\end{array} \right.$
C
)A.$\left\{\begin{array}{l} 7y= x+3,\\ 8y+5= x\end{array} \right.$
B.$\left\{\begin{array}{l} 7y= x+3,\\ 8y-5= x\end{array} \right.$
C.$\left\{\begin{array}{l} 7y= x-3,\\ 8y= x+5\end{array} \right.$
D.$\left\{\begin{array}{l} 7y= x-3,\\ 8y= x-5\end{array} \right.$
答案：
C
4. 七年级学生在会议室开会,每排座位坐12人,则有11人无处坐;每排座位坐14人,则余1人独坐一排.这间会议室共有座位的排数是 (
A.14
B.13
C.12
D.15
C
)A.14
B.13
C.12
D.15
答案：
C
1. 已知$3x^{2m}-2y^{n}= 1$是关于x,y的二元一次方程,则$mn= $
0.5
.
答案：
0.5
2. 请写出二元一次方程$x+y= 5$的一组正整数解:
$\left\{\begin{array}{l} x = 1,\\ y = 4\end{array}\right.$（答案不唯一）
.
答案：
$\left\{\begin{array}{l} x = 1,\\ y = 4\end{array}\right.$（答案不唯一）
3. 已知方程$x+y= 5$,用含x的式子表示y,则$y= $
5 - x
.
答案：
5 - x
4. 二元一次方程$y+2x= 5$在正整数范围内的解是
$\left\{\begin{array}{l} x = 1,\\ y = 3;\end{array}\right.$$\left\{\begin{array}{l} x = 2,\\ y = 1\end{array}\right.$
.
答案：
$\left\{\begin{array}{l} x = 1,\\ y = 3;\end{array}\right.$$\left\{\begin{array}{l} x = 2,\\ y = 1\end{array}\right.$
5. 如果方程组$\left\{\begin{array}{l} ax+2y= b,\\ 4x-by= 2a-1\end{array} \right. 的解是\left\{\begin{array}{l} x= 1,\\ y= -1,\end{array} \right. 则a= $
3
,$b= $1
.
答案：
3 1
6. 如图所示的两架天平都保持平衡,且每块巧克力的质量相等,每个果冻的质量也相等,则一块巧克力的质量是
20
g.
答案：
20
三、解方程组
1. $\left\{\begin{array}{l} x+2y= 4,\\ 4x+9y= 18.\end{array} \right.$
解：
2. $\left\{\begin{array}{l} 2x+3y= 7,\\ 3x+2y= 8.\end{array} \right.$
解：
1. $\left\{\begin{array}{l} x+2y= 4,\\ 4x+9y= 18.\end{array} \right.$
解：
$\left\{\begin{array}{l} x = 0,\\ y = 2.\end{array}\right.$
2. $\left\{\begin{array}{l} 2x+3y= 7,\\ 3x+2y= 8.\end{array} \right.$
解：
$\left\{\begin{array}{l} x = 2,\\ y = 1.\end{array}\right.$
答案：
$\left\{\begin{array}{l} x = 0,\\ y = 2.\end{array}\right.$
@@$\left\{\begin{array}{l} x = 2,\\ y = 1.\end{array}\right.$
@@$\left\{\begin{array}{l} x = 2,\\ y = 1.\end{array}\right.$
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