问题
选择题
如果直线y=2x+m与两坐标轴围成的三角形面积等于4，则m的值是（ ）
A．±3
B．3
C．±4
D．4
答案
直线与x轴的交点为：（-
，0），与y轴的交点为：（0，m），m 2
∴
|1 2
|•|m|=4，解得m=±4．m 2
故选C．
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如果直线y=2x+m与两坐标轴围成的三角形面积等于4，则m的值是（ ）
A．±3
B．3
C．±4
D．4
直线与x轴的交点为：（-
，0），与y轴的交点为：（0，m），m 2
∴
|1 2
|•|m|=4，解得m=±4．m 2
故选C．
Mona has an interesting hobby. She collects stamps. She spends a lot of time on her stamp collection after school hours. 小题1: They are all in color.Mona likes stamps with pictures of animals and birds on them. 小题2: She also borrows books on animals and birds from her school library. She learns many things about them.Sometimes Mona has many stamps of the same kind. She gives them to her classmates. 小题3: Mona writes to her friends in many countries. 小题4: In return, they send her stamps of their countries. Mona’s father also gives her stamps. He brings them home from his office for her and he often enjoys the stamps with her. But Mona’s mother never gives her stamps because she thinks spending too much time on it is bad for study. Many of Mona’s friends collect other things. 小题5: But, all of them say that Mona’s collection is the most interesting of all.
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