一元一次不等式组的解集是指一元一次不等式组中各个不等式解集的公共部分，除教材中通过数轴，直观地表示出解集的公共部分外，还可用四句口快来揭示一元一次不等式组解集的确定规律，即：“同大于取大的，同小于取小的，两界之间要连写，两界之外是空集．”一、同大于型设a＜ The solution set of a one-time inequality group refers to the common part of each inequality solution set in a one-time inequality group. Except for the number of axes in the textbook, the public part of the solution set is visually represented, and the four-port inequality can be used to reveal the one-time inequality. The law of determination of group solution sets is: “The same is greater than the largest, the same as less than the smallest, the two circles should be written together, and the two circles are empty sets.”