Nhờ mọi người giúp mình. Cám ơn nha ❤️
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a: Khi m=1 thì hệ sẽ là x+y=1 và x-y=2
=>x=1,5; y=0,5
b: \(\Leftrightarrow\left\{{}\begin{matrix}x=1-y\\m\left(1-y\right)-y=2m\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=1-y\\m-my-y=2m\end{matrix}\right.\)
=>x=1-y và y(-m-1)=m
=>x=1-y và y=-m/m+1
=>x=1+m/m+1=2m+1/m+1 và y=-m/m+1
Để x,y nguyên thì 2m+1 chia hết cho m+1 và -m chia hết cho m+1
=>\(m+1\in\left\{1;-1\right\}\)
=>\(m\in\left\{0;-2\right\}\)
4 I like durian very much and so does my father
5 You should wash your hand before you eat
6 It is healthy to keep a good diet
7 We need a pair of paddles to play table tennis
8 Teenagers like to listen to the latest pop music
9 Sugar gives you energy and you feel less hungry
10 Badminton becomes a very popular sport activity
11 We mus to eat sensibly
12 He is a skillful football player
13 In moderate amount, sugar is good for you
14 Don't forget to brush your teeth regularly
15 Swimming can be fun but accidents can happen
1. That test is shorter than this text.
2. What a hot living room!
3. That toy car is more expensive than this toy car.
4. What a fresh milk!
5. Minh's school is smaller than Nam's school.
6. What an awful weather!
7. What an expensive car!
8. Minh is shorter than Tom.
9. Her test is worst than my test.
10. What an awfulday!
11. That car is cheaper than this car.
12. What fresh apples!
13. Minh's school is smaller than Nam's school.
14. What an awful weather!
15. What a cheap motorbike!
16. Hoa is taller than Nam.
17. What a nice girl!
18. What a terrible weather!
19. What a lovely door!
20. What interesting books!
Với danh từ không đếm được như milk hay weather thì với câu cảm thán chúng ta không cần có giới từ nữa, nên cô góp ý một số câu sau nhé:
4. What fresh milk!
6. What awful weather!
9. Her test is worse than my test.
10. What an awful day!
14. What awful weather!
18. What terrible weather!
Những câu còn lại em đã giúp bạn rất tốt!