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K
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K
15 tháng 1 2022
IV.
A.
1. I rarely play hopscotch with my friends at school.
2. I often play badmiton with my dad on the weekends.
3. My parents usually buy new books at the bookstore.
4. My sister never does martial arts after school.
5. We often go to the library to read books and study.
6. My mom always goes to the supermarket after work.
B.
1. We decorate houses at Halloween.
2. John sometimes plays video games with his friends after school.
3. Fashion show starts at 8 p.m.
4. How do people prepare for Christmas?
5. How often do you go shopping?
6. The bus leaves at 10 a.m.
KV
29 tháng 12 2022
a) ĐKXĐ:
x³ - 1 khác 0
x khác 1
b) A = (5x² + 5x + 5)/(x³ - 1)
= 5(x² + x + 1)/[(x - 1)(x² + x + 1)]
= 5/(x - 1)
Thay x = 7 vào A, ta được:
A = 5/(7 - 1)
= 5/6
8 tháng 1 2022
1. I would like to have a cheeseburger.
2. Let's go to the movie theater.
3. Simon's hobby is playing soccer in his free time.
4. Tom has black curly hair.
5. There are four people in my family.
13 tháng 3 2022
\(\Delta H=1.E_{C=C}+4.E_{C-H}+1.E_{H-H}-1.E_{C-C}-6.E_{C-H}\)
= 1.142,5 + 4.99 + 1.104,2 - 1.78 - 6.99 = -29,3 (kcal/mol)
=> A
ta có :
\(4.\left(3x-1\right)^3-25=475\)
\(\Leftrightarrow4.\left(3x-1\right)^3=500\Leftrightarrow\left(3x-1\right)^3=125\)
\(\Leftrightarrow3x-1=5\Leftrightarrow x=2\)
4 . ( 3x - 1)3 - 52 = 475
4 . ( 3x - 1 )3 - 25 =475
4 . ( 3x - 1 )3 = 475 + 25
4 . ( 3x - 1 )3 = 500
( 3x - 1 )3 = 500 : 4
( 3x - 1 )3 = 125
( 3x - 1 )3 = 53
3x - 1 = 5
3x = 5 + 1
3x = 6
x = 6:3
x = 2