问题
解答题
实数m取什么值时,复数z=m+1+(m-1)i是:
(1)实数;(2)虚数;(3)纯虚数.
答案
(1) m=1 (2) m≠1 (3) m=-1
(1)当m-1=0,即m=1时,复数z是实数.
(2)当m-1≠0,即m≠1时,复数z是虚数.
(3)当m+1=0,且m-1≠0,即m=-1时,复数z是纯虚数.
实数m取什么值时,复数z=m+1+(m-1)i是:
(1)实数;(2)虚数;(3)纯虚数.
(1) m=1 (2) m≠1 (3) m=-1
(1)当m-1=0,即m=1时,复数z是实数.
(2)当m-1≠0,即m≠1时,复数z是虚数.
(3)当m+1=0,且m-1≠0,即m=-1时,复数z是纯虚数.
Hi! I’m Alex Greenall. I’m thirteen and I go to Park school in Oxford, England. I go to school _______ weekdays, but not on Saturday and Sunday. This is my school day. I ________ at half past seven in the morning, and then have breakfast. My school is _______ my house. I go to school at half past eight and see my friends. We start work _______ nine o’clock. We have three lessons in the morning. _______ favorite subject is art. At eleven o’ clock, we ________ in the playground and I talk ______ my friends. They go to the playground and play football, _______ I don’t like football. We have lunch in the dining hall at half past twelve. I like school lunch! We have meat and rice with vegetable, or hamburgers. I drink juice _________ water. We start lessons in the afternoon at half past one. We have two lessons in the afternoon. Then we go home at half past three. In the evening, I watch TV and have dinner _____ my family. I do my homework and go to bed at ten o’clock.
|