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．
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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.
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