问题
解答题
解方程组：
|
答案
5u+2v=25① 3u+4u=8②
由①×2-②，得7u=42，
u=6，
代入①得，5×6+2v=25，
v=-
．5 2
∴原方程组的解为
．u=6 v=- 5 2
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解方程组：
|
5u+2v=25① 3u+4u=8②
由①×2-②，得7u=42，
u=6，
代入①得，5×6+2v=25，
v=-
．5 2
∴原方程组的解为
．u=6 v=- 5 2
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★Catch your breath or do something that lets you relax for a 小题2: minutes, especially when you’re in a 小题3: where you feel angry or hopeless. ★Talk to people you believe in . They make you realize (意识到) that you’re not 小题4: . Friends can help you when you are in 小题5: . Talking to parents is important, too. Parents may 小题6: your easily because they have experience in dealing with bad moods. Keeping 小题7: inside can make them seem much worse. ★Exercise. Exercise can improve your moods quickly. You can go for a run, play tennis or ride your bike. ★Get enough sleep. You can小题8: down and get some rest. Being tired can result in more sadness. ★Cry(哭). There’s nothing wrong 小题9: crying. In fact, it often makes a person feel better. ★Ask a doctor for help. If your bad moods are out of小题10: , for example, they interfere with(妨碍) the way you deal with friends, parents, studies or activities, you need to talk to doctors about what you can do to feel better. |