求线性方程组的全部解。
解:将方程组的增广矩阵化为阶梯形
暂无解析
There were many more people who got injured in the big fire than _______.
2013年,某市科技馆共售出了3万张入场券。2014年,该市新建的天文馆和自然博物馆开放了,当年这3家场馆售出的入场券累计达到9.5万张。这说明建天文馆和自然博物馆的投入是值得的,因为现在到这些场馆接受科普教育的市民增加了2倍多。如果以下哪项陈述为真,最能削弱上述结论?
The organization broke no rules, but ______had it acted responsibly.
职权统一是管理的一大原则,而现实中“越权”现象确实屡屡出现,越权是指去做超越职责范围的事物,这会降低管理效率、影响组织发展。______所描述的现象不属于越权行为。
We all think that _____ no need to make laws to prevent the young from getting married during their college life.