nhờ mn gải giúp 22 23 :))
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LT
2
Z
13 tháng 11 2021
a, 23 + ( -77 ) + ( -23 ) + 77
= [ 23 + ( -23 ) ] + [ ( -77 ) + 77 ]
= 0 + 0 = 0
b, ( -2020 ) + 2021 + 21 + ( -22 )
= ( - 2020 ) + 2021 + 21 + ( -21 ) + ( -1 )
= [ ( -2020 ) + 2021 + ( -1 ) ] + [ 21 + ( -21 ) ]
= 0 + 0 = 0
DT
Đỗ Thanh Hải
CTVVIP
1 tháng 7 2021
22. A lot of fish has died recently because of the _____________ water in this lake.
A. contaminating B. contaminated C. contaminate D. contaminant
23. If the air was clean, we _____________ have to wear masks when going out.
A. wouldn’t B. won’t C. would D. will
24. If I _____________ you, I _____________ water from that dirty tap
A. am - will drink B. am - won’t drink C. were - would drink D. were - wouldn’t drink 2
5. If he _____________ trash around his garden, the garden would look very nice now.
A. will throw B. would throw C. didn’t throw D. doesn’t throw
26. Price and availability are the _____________ factors that will determine product success.
A. critical B. musical C. physical D. medical
27. If it rains, we _____________ the match.
A. cancel B. will cancel C. cancelled D. cancelling
28. If I were a tree, I _____________ the rain.
A. love B. loved C. will love D. would love
29. The decor inside the house was very_____________.
A. fantastic B. electric C. mechanic D. artistic
30. If she _____________ late, we will go without her.
A. am B. is C. was D. were
31. If I _____________ where she lived, I would go and see her.
A. know B. knows C. to know D. knew
32. We need to be more _____________ about this problem.
A. scientific B. majestic C. domestic D. alphabetic
33. The election campaign has been focused mainly on _____________ issues.
A. dialectical B. energetic C. domestic D. conical
34. If I _____________ the lottery, I would be a millionaire.
A. win B. wins C. winning D. won
35. I will discuss that problem with him if I _____________ him tomorrow.
A. see B. sees C. to see D. seeing
36. If I knew Chinese, I _____________ for job in China.
A. will apply B. would apply C. will be applied D. would be applied
37. She was unable to find a _____________ job.
A. important B. importantly C. permanent D. permanently
38. Any company found to be breaking these rules will be heavily _____________.
A. fined B. done C. made D. got
39. These figures are for _____________ purposes only
. A. illustrate B. illustrating C. illustrative D. illustration
40. I would go jogging with Mark if he _____________ here today.
A. is B. will be C. were D. would be
41. Many species of wildlife are becoming extinct, _____________ the rainforests are being destroyed.
A. therefore B. since C. consequently D. so
42. Hemp can be used to make paper, _____________ it could reduce the need for logging.
A. consequently B. due to C. so D. since
43. _____________ logging provides jobs and profits, the government is reluctant to control it.
A . So B. Consequently C. Since D. Due to
44. Hemp was grown throughout history_____________ its versatility; it can be used to make many different things.
A. due to B. because C. since D. as a result
45. Hemp is related to the marijuana plant; _____________ it is illegal in many countries.
A. so B. due to C. as a result D. because
46. The polluted chemical waste was dumped into the ocean; _____________,the mass of fish died.
A. because B. as C. because of D. consequently
47. It was guessed that the fish died_____________ a powerful toxin in the sea water.
A. because of B. because C. since D. as a result
48. Many species in BC are threatened _____________ logging.
A. so B. because C. since D. due to
49. Smoking can_____________ heart disease.
A. lead to B. create C. causes D. due to
50. Radioactive pollution is increasing _____________ the increased use of radioactivity.
A. as B. since C. because of D. because
DT
21 tháng 1 2022
Mình chỉ sửa cho bạn Hải là câu 24 phải là D nha vì nếu là would drink thì chả lẽ là uống nước bẩn?Và câu 26 phải là medical nha, bài này cô chữa cho mình nên không sai đâu.
12 tháng 9 2021
\(B=2+2^2+2^3+2^4+...+2^{99}+2^{100}=2\left(1+2^2+2^3+2^4\right)+...+2^{96}\left(1+2^2+2^3+2^4\right)=2.31+2^6.31+...+2^{96}.31=31\left(2+2^6+...+2^{96}\right)⋮31\)
HN
1
13 tháng 7 2021
b) 917-(417-65)
= 917- 352
= 565
c) 31-[26-(2017+35)]
= 31-[26-2052]
= 31- (-2026)= 31+2026= 2057
g) -418-{-218-[-118-(-131)]+2017}
= -418-{-218-[-118+131]+2017}
= -418-{-218-13+2017}
= -418-1786
= -2204
Các câu còn lại thì bạn làm tương tự nha!( nhân chia trước, cộng trừ sau, trong ngoặc làm trước ngoài ngoặc làm sau)
18 tháng 11 2021
\(a,\Rightarrow2A=2+2^2+...+2^{2011}\)
\(\Rightarrow2A-A=2+2^2+...+2^{2011}-2^0-2-..-2^{2010}\)
\(\Rightarrow A=2^{2011}-1=B\)
\(b,A=2019.2011=\left(2010-1\right)\left(2010+1\right)=\left(2010-1\right).2010+\left(2010-1\right)=2010^2-2010+2010-1=2010^2-1< 2010^2=B\)
18 tháng 11 2021
\(a,\Rightarrow2A=2^1+2^2+...+2^{2011}\\ \Rightarrow2A-A=A=2^{2011}-2^0=2^{2011}-1=B\)
\(b,A=\left(2010-1\right)\left(2010+1\right)=2010^2+2010-2010-1=2010^2-1< 2010^2=B\)
20 tháng 12 2019
( -23 ) + 105 = 105 - 23
= 82
78 + ( -123 ) = -( 123 - 78 )
= -45
( -23) + 13 = -( 23 - 13 )
= -10
( -23 ) + ( -13 ) = -( 23 + 13 )
= - 36
( -75 ) + ( -50 ) = -( 75 + 50 )
= -125
( -20 ) + | -88 | = ( -20 ) + 88
= 88 - 20
= 68
| -37 | + (-|15|) = 37 + ( -15 )
= 37 - 15
= 22
(-|-22|) + ( -|16|) = ( -22 ) + ( -16 )
= -38
( -23 ) + 13 + ( -17 ) + 57 = [(-23) + 13 ] + [(-17) + 57 ]
= 10 + 40
= 50
(-123) + |-13| + (-7) = (-123) + 13 + (-7)
= 110 + (-7)
= 103
|0| + |45| + (-|-455|) + |-796| = 0 + 45 + (-455) + 796
= [ 796 + (-455) ] + 45
= 341 + 45
= 386
Tui làm chi tiết lắm rồi đó ^_^
20 tháng 12 2019
\(=-23-\left(-105\right)=82\)
\(=78-123=-45\)
\(=-23-\left(-13\right)=-10\)
\(=-36\)
\(=-125\)
\(=-20-\left(-88\right)=68\)
Phần dưới tự làm nha
Câu 22: B
Câu 23: C
22:b
23:c