根据二次根式有意义,分式有意义得:x-2≥0且x+3≠0,
解得:x≥2,x≠-3,
即x≥2,
故答案为:x≥2.
阅读理解,判断正(T)误(F)。
There are many rules in my school. We must wear school uniforms when in school. We have to get
to school before seven o'clock in the morning. In class, we mustn't eat or drink. During the breaks, we
mustn't run in the hallways. But we can listen to music in the hallways. We also can't leave school until
we finish (完成) our homework. I don't like school.
So my favorite days are Saturday and Sunday. How about you?
( )1. The writer can wear what she likes to school.
( )2. The writer has to arrive at school before seven in the morning.
( )3. Eating in class is allowed (允许).
( )4. Listening to music in the classroom is allowed.
( )5. All homework must be finished before one can leave school.
读黄河中游局部地区图及该地区土壤侵蚀研究统计图,回答小题。
小题1: 该区域
A.自然带差异由热量决定
B.属于我国西部经济地带
C.农业生产以畜牧业为主
D.地势总体西北高东南低小题2: 据图分析
A.人口密度越高,侵蚀强度越大
B.侵蚀强度仅与人口、植被有关
C.侵蚀严重促使该区调整农业结构
D.生态恶化使区内人口大规模外迁