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字母系数二元一次方程组(1)打印
时间：2015-04-23 14:41:25 下载该word文档
字母系数二元一次方程组
例1 若![](https://wkrtcs.bdimg.com/rtcs/image?w=51&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"51","h":"45","dataType":"gif","c":"word/media/image1.png"})
是二元一次方程组的解，求m、n的值。
例2 已知方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=77&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"77","h":"45","dataType":"gif","c":"word/media/image3.png"})
与有相同的解，求a、b的值。
例3 关于x、y的方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=91&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"91","h":"45","dataType":"gif","c":"word/media/image5.png"})
的解中x与y的和等于1，则m的值是 。
例4 k为何值时方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=109&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"109","h":"48","dataType":"gif","c":"word/media/image6.png"})
无解？
例5 小刚在解方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=81&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"81","h":"45","dataType":"gif","c":"word/media/image7.png"})
时，本应解出由于看错了系数c，而得到的解为求的值。
例6 要使方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=88&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"88","h":"45","dataType":"gif","c":"word/media/image11.png"})
有正整数解，求整数a的值。
［练一练］
1、方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=81&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"81","h":"63","dataType":"gif","c":"word/media/image12.png"})
的解中x与y相等，则k＝ 。
2、在二元一次方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=104&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"104","h":"45","dataType":"gif","c":"word/media/image13.png"})
中，当m＝ 时，这个方程组有无数组解。
3、已知关于x、y的方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=80&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"80","h":"45","dataType":"gif","c":"word/media/image14.png"})
的解是求a＋b的值。
4、已知关于x、y的方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=87&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"87","h":"45","dataType":"gif","c":"word/media/image16.png"})
的解也是方程的解，求m。
5、小明和小言同时解方程组![](https://wkrtcs.bdimg.com/rtcs/image?w=197&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"197","h":"48","dataType":"gif","c":"word/media/image18.png"})
小明把方程①抄错了，求得的解为![](https://wkrtcs.bdimg.com/rtcs/image?w=53&md5sum=68b88878428723dcba82eb3d17f583c4&sign=8721f1a870&rtcs_flag=1&rtcs_ver=3.2&l=webapp&bucketNum=52&ipr={"t":"img","w":"53","h":"45","dataType":"gif","c":"word/media/image19.png"})
小言把方程②抄错了，求得的解为求原方程组的解。
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字母系数二元一次方程组(1)打印
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