1．在方程![](https://wkrtcs.bdimg.com/rtcs/image?w=77&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"77","h":"22","dataType":"wmf","c":"word/media/image1.png","imgOriW":154,"imgOriH":44})
中，如果用含有的式子表示，则 ．
2．已知：![](https://wkrtcs.bdimg.com/rtcs/image?w=45&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"45","h":"48","dataType":"gif","c":"word/media/image5.png"})
是方程kx-y=3的解，则k的值是（ ）
A.2 B.-2 C.1 D.-1
3．已知二元一次方程3x－y=1，当x=2时，y等于（ ）
A．5 B．－3 C．－7 D．7
4．下列是二元一次方程的是 （ ）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=67&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"67","h":"19","dataType":"gif","c":"word/media/image6.png"})
B．3x=2y C． D．
5．方程2x﹣3y=4，![](https://wkrtcs.bdimg.com/rtcs/image?w=72&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"72","h":"44","dataType":"png","c":"word/media/image9.png","imgOriW":72,"imgOriH":44})
，，2x+3y﹣z=5，x2﹣y=1中，是二元一次方程
的有（ ）
A．1个 B．2个 C．3个 D．4个
6．已知![](https://wkrtcs.bdimg.com/rtcs/image?w=47&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"47","h":"48","dataType":"png","c":"word/media/image11.png","imgOriW":47,"imgOriH":48})
满足方程kx﹣2y=1，则k等于（ ）
A．3 B．4 C．5 D．6
7． 20位同学在植树节这天共种了52棵树苗，其中男生每人种3棵，女生每人种2棵，设
男生有x人，女生有y人，根据题意，列方程组正确的是（ ）
A.![](https://wkrtcs.bdimg.com/rtcs/image?w=85&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"85","h":"45","dataType":"wmf","c":"word/media/image12.png","imgOriW":170,"imgOriH":90})
B.
C.![](https://wkrtcs.bdimg.com/rtcs/image?w=85&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"85","h":"45","dataType":"gif","c":"word/media/image14.png"})
D.
8．方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=79&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"79","h":"45","dataType":"wmf","c":"word/media/image16.png","imgOriW":158,"imgOriH":90})
的解是（ ）
A．![](https://wkrtcs.bdimg.com/rtcs/image?w=57&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"57","h":"45","dataType":"wmf","c":"word/media/image17.png","imgOriW":114,"imgOriH":90})
B． C． D．
9．方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=71&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"71","h":"45","dataType":"gif","c":"word/media/image21.png"})
的解满足方程x＋y－a=0，那么a的值是
A．5 B．－5 C．3 D．－3
10．如果![](https://wkrtcs.bdimg.com/rtcs/image?w=65&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"65","h":"24","dataType":"gif","c":"word/media/image22.png"})
＋（2x－y－4）2=0，则xy= ．
11．已知![](https://wkrtcs.bdimg.com/rtcs/image?w=55&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"55","h":"48","dataType":"gif","c":"word/media/image23.png"})
是二元一次方程2x+my=1的一个解，则m= ．
12．将方程3y–x = 2 变形成用含y的代数式表示x ，则 x=________．
13．梯形上底的长是x，下底的长是15，高是6，梯形面积y与上底长x之间的关系式是
14．已知![](https://wkrtcs.bdimg.com/rtcs/image?w=45&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"45","h":"48","dataType":"gif","c":"word/media/image24.png"})
是方程5x-ky=7的一个解，则k= .
15．母亲节那天，很多同学给妈妈准备了鲜花和礼盒．从图中信息可知一束鲜花的价格是____
元．
![](https://wkrtcs.bdimg.com/rtcs/image?w=351&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"351","h":"93","dataType":"png","c":"word/media/image25.png","imgOriW":351,"imgOriH":93})
16．已知方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=77&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"77","h":"45","dataType":"gif","c":"word/media/image26.png"})
和有相同的解，则a＋b的值为 ．
17．一张试卷共25道题，做对一道题得4分，做错或不做倒扣1分，小红做完试卷得70
分，则她做对了 道题．
18．解二元一次方程组：![](https://wkrtcs.bdimg.com/rtcs/image?w=84&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"84","h":"45","dataType":"gif","c":"word/media/image28.png"})
．
19．解方程组：
（1）![](https://wkrtcs.bdimg.com/rtcs/image?w=71&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"71","h":"45","dataType":"gif","c":"word/media/image29.png"})
（2）
20．解方程组：![](https://wkrtcs.bdimg.com/rtcs/image?w=88&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"88","h":"48","dataType":"wmf","c":"word/media/image31.png","imgOriW":176,"imgOriH":96})
21．解方程组（5分）
（1）![](https://wkrtcs.bdimg.com/rtcs/image?w=83&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"83","h":"48","dataType":"gif","c":"word/media/image32.png"})
22．解下列二元一次方程组
（1）![](https://wkrtcs.bdimg.com/rtcs/image?w=107&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"107","h":"48","dataType":"gif","c":"word/media/image33.png"})
(2)
23．解方程组
![](https://wkrtcs.bdimg.com/rtcs/image?w=124&md5sum=207eefc288a88e35254f31702f8c56e6&sign=fc63d514cb&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=48&ipr={"t":"img","w":"124","h":"48","dataType":"wmf","c":"word/media/image35.png","imgOriW":248,"imgOriH":96})
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