4周用分式（式子题）
一、分式的概念、分式的基本性质
1.已知<Object: word/embeddings/oleObject1.bin>
为有理数，要使分式
<Object: word/embeddings/oleObject2.bin>
的值为非负数，
<Object: word/embeddings/oleObject3.bin>
应满足的条件是（
）A.<Object: word/embeddings/oleObject4.bin>
B.<Object: word/embeddings/oleObject5.bin>
C.<Object: word/embeddings/oleObject6.bin>
D.<Object: word/embeddings/oleObject7.bin>
，或<Object: word/embeddings/oleObject8.bin>
2、当x为何值时，分式
<Object: word/embeddings/oleObject9.bin>
的值为零
3、已知<Object: word/embeddings/oleObject10.bin> ...