二元一次方程组计算题专项训练
一、用代入法解下列方程组
（1）![](https://wkrtcs.bdimg.com/rtcs/image?w=79&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"79","h":"48","dataType":"gif","c":"word/media/image1.png"})
（2）
二、用加减法解下列方程组
（1）![](https://wkrtcs.bdimg.com/rtcs/image?w=107&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"107","h":"48","dataType":"gif","c":"word/media/image3.png"})
（2）
三、用适当的方法解下列方程组：
1、![](https://wkrtcs.bdimg.com/rtcs/image?w=119&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"119","h":"52","dataType":"gif","c":"word/media/image5.png"})
2、
（3）![](https://wkrtcs.bdimg.com/rtcs/image?w=121&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"121","h":"69","dataType":"gif","c":"word/media/image7.png"})
4、
![](https://wkrtcs.bdimg.com/rtcs/image?w=392&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"392","h":"79","dataType":"png","c":"word/media/image9.png","imgOriW":392,"imgOriH":79})
7![](https://wkrtcs.bdimg.com/rtcs/image?w=76&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"76","h":"75","dataType":"gif","c":"word/media/image10.png"})
8
四、解答题
1、如果![](https://wkrtcs.bdimg.com/rtcs/image?w=161&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"161","h":"24","dataType":"gif","c":"word/media/image12.png"})
是一个二元一次方程，那么数=？ =？
2、已知![](https://wkrtcs.bdimg.com/rtcs/image?w=47&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"47","h":"41","dataType":"gif","c":"word/media/image15.png"})
与都是方程y=kx+b的解，则k与b的值为多少？
3、若方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=107&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"107","h":"48","dataType":"gif","c":"word/media/image17.png"})
的解之和为x+y=-5，求k的值，并解此方程组．
4、已知方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=84&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"84","h":"48","dataType":"gif","c":"word/media/image18.png"})
与的解相同，那么a=?b=?
5、关于x、y的方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=75&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"75","h":"41","dataType":"gif","c":"word/media/image20.png"})
的解是方程3x+2y=17的一组解，那么m的值是多少？
6、一个星期天，小明和小文同解一个二元一次方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=107&md5sum=ea4de62c21e70a4edb9b9668d6fa1227&sign=5e8041e084&rtcs_flag=1&rtcs_ver=3.1&l=webapp&bucketNum=54&ipr={"t":"img","w":"107","h":"43","dataType":"gif","c":"word/media/image21.png"})
小明把方程①抄错，求得的解为，小文把方程②抄错，求得的解为，求原方程组的解。
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