bài giải

chu vi mặt đáy là:

30+20+30+20=100(cm)

diện tích xung quanh là:

100*15=1500(cm2)

diện tích 1 mặt đáy là:

30*20=600(cm2)

diện tích tôn để làm cái hộp đó là:

1500+600=2100(cm2)

                    đáp số:2100 cm2

bất cứ số nào nhân 0 đều = 0

3C=3+3^2+3^3+......+3^21

3C-C=3^21-1-3^20=3^20.2=1

=>C=3^20-0,5

câu trả lời là dư 1 nha

In my last job we wore a uniform. In my last job we used to wear a uniform.

1 In my twenties I had long hair. I USED TO HAVE LONG HAIR IN MY TWENTIES.

2 I played tennis last Sunday. _______________________X_____________________

3 When you were a child, did you wear glasses? DID YOU USE TO WEAR GLASSES (WHEN YOU WAS A CHILD)?

4 You didn’t tell us about your new job. __________________X____________________

5 John went to school in Wisconsin. JOHN USED TO GO TO SCHOOL IN WISCONSIN.

6 Sheila didn’t like her English teacher at school. SHE DIDN'T USED TO LIKE HER ENGLISH TEACHER AT SCHOOL.

7 Did you see Peter yesterday? ______________________X______________________

8 People went to the barber to pull out their teeth. PEOPLE USED TO GO TO THE BARBER TO PULL OUT THEIR TEETH.

MÌNH K NÓI LÀ MÌNH SẼ ĐÚNG HẾT NHƯNG VÌ 'USED TO' CHỈ ĐƯỢC DÙNG KHI MIÊU TẢ 1 THÓI QUEN NÀO ĐÓ KÉO DÀI TRONG QUÁ KHỨ NÊN MỚI CHIA THẾ ☘

Aluminum is a valuable metal that ( can , use ) CAN BE USED again and again . because this metal ( can ,recycle) CAN BE RECYCLES, aluinium cans (should , not throw away ) SHOULD NOT BE THROWN AWAY.

Kết quả là 59! Ko biết cách làm!

ko dang linh tinh

317.58 m2 nhé !!!

đúng 100% mình làm rồi

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