问题
填空题
若ab＜0，则
|
答案
∵a2b≥0，
∴b≥0，
而ab＜0，
∴a＜0，b＞0，
∴原式=
•a2
=|a|•b
=-ab
．b
故答案为-a
．b
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若ab＜0，则
|
∵a2b≥0，
∴b≥0，
而ab＜0，
∴a＜0，b＞0，
∴原式=
•a2
=|a|•b
=-ab
．b
故答案为-a
．b
| 情景对话。 | |
| A: It's a hot day, isn't it? B: Yes, it's quite hot. I thought it would be cooler, so I come here to spend my holiday. A: Well. 1______ during the day time it's hot but at night it's much cooler. The temperature from June to August is about 25°C－33°C. B: Really? 2______ What about the weather in winter? A: It often snows and it's very cold. The lowest temperature is usually 30°C below zero at night. So we have the Ice and Snow Festival. B: 3______ A: Right. Harbin is on of the eight cities. I hope we will have good luck. B: I find people in Harbin are working hard on it; 4______ More trees and grass are being planted. The air is getting cleaner and cleaner. A: Yes. 5______ With the help of the people all over the country and with the development of our country, I think Harbin will win. B: I hope so. Best wishes for Harbin !
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