Một mảnh vườn hình chữ nhật có chiều dài 18m, chiều rộng là 12m. a) Tính diện tích mảnh vườn. b) Người ta có chiều rộng 2 m để làm lối đi xung quanh mảnh vườn, phần diện tích còn lại dùng để trồng rau. Tính diện tích làm lối đi. c) nếu dùng các viên gạch hình vuông có kích thước 50 cm để lát phần lối đi, hỏi cần dùng bao nhiêu viên gạch thì đủ ? MIK CẦN TRC 1H CHIỀU NAY Ạ😢🤯😖

1. John cannot make a _______ to get married to Mary or stay single until he can afford a house and a car.
a. decide
b. decision
c. decisive
d. Decisively

   MIK CẦN TRC 7H SÁNG MAI NHÉ
2. She often drives very ________ so she rarely causes accident .
a. carefully
b. careful
c. caring
d. Careless
3. All Sue’s friends and __________ came to her party .
a. relations
b. Relatives
c. relationship
d. Related
4. My father studies about life and structure of plants and animals. He is a ……….
a. biology
b. biologist
c. biological
d. biologically
5. She takes the …….. for running the household.
a. responsibility
b. responsible
c. responsibly
d. responsiveness.
6. We are a very close-nit family and very ….. of one another.
a. supporting
b. supportive
c. support
d. supporter
7. You are old enough to take _______ for what you have done.
a. responsible
b. responsibility
c. responsibly
d. irresponsible
8. He has been very interested in doing research on _______ since he was at high school.
a. biology
b. biological
c. biologist
d. biologically
9. Although they are twins, they have almost the same appearance but they are seldom in __.
a. agree
b. agreeable
c. agreement
d. Agreeably
10. The more _______ and positive you look, the better you will feel.
a. confide
b. confident
c. confidently
d. Confidence
11. My parents will have celebrated 30 years of _______ by next week.
a. marry
b. married
c. marriageable
d. marriage
12. London is home to people of many _______ cultures.
a. diverse
b. diversity
c. diversify
d. diversification

Cho A=1+2²+2⁴+...+2²⁰²⁰+2²⁰²²; B=2²⁰²³. Chứng minh rằng 3A và 2B là hai số tự nhiên liên tiếp.

   CẦN TRC 7H SÁNG MAI Ạ