阅读下面的选文,回答问题。
操切齿曰:“陶谦纵兵杀吾父,此仇不共戴天!吾今悉起大军,洗荡徐州,方雪吾恨!”遂留荀攸、程昱领军三万守鄄城、范县、东阿三县,其余尽杀奔徐州来。夏侯、于禁、典韦为先锋。操令:但得城池,将城中百姓,尽行屠戮,以雪父仇。
After working all day,he was so tired that he was in no______to go to the party with us.
解方程组: {2x−y=33x+2y=8 .