Tổng số hạt của ngtử là 13.Xác định A,p,e,n.Biết 1lớn hơn hoặc bằng n/Z nhỏ hơn hoặc bằng 1,5.

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Đáp án:

Giải thích các bước giải:

Đáp án:

Giải thích các bước giải: gọi z là số hạt proton

Ta có:z+e+n=13

Mà P=e

->z+e=2p (1)

Mà n:z lớn hơn or bằng 1 và bé hơn hoặt bằng 1.5

-> 3,7> = Z< = 4.3

Mà z là số nguyên -> z= 3 hoặc 4

Ta có:

Z=3 -> n=8 (loại)

Z=4-> n=5(nhận) -> A= 9

?thấy vậy chứ dể hiểu lắm cố lên nha ?

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Mark the letter A, B, e,or D to indicate the underlined part that needs correction in each of the following questions. ( sửa lỗi luôn ạ) 51. A lot of people think that marriage women shouldn't pursue a career. A B C D 52. We must stop discrimination on people coming from the rural area. A B C D 53. My brother is good with cooking and he can cook very delicious food. A B C D 54. I guess they may be kept home doing housework and look after their chifdren, A B C D 55. Women in rural areas might be forced to work both at home but on the fields. A B C D 56. Some people think that girls shouldn't be allowed to going to university. A B C D 57. Gender discrimination should be eliminated for create equal opportunities in educationfor everyone. A B C D 58. More girls should being chosen to represent us in the School Youth Union .. A B C D 59. Both women and men should be given equal rights for education and employment. A B C D 60. This discrimination against women and girls must be abolishing. A B C D 61. Efforts should be make to offer all children equal access to education. A B C D 62. It is clear that gender differences cannot prevent a person to pursue a job. A B C D 63. Traditional women were mainly responsible to doing housework and looking after their husbands and A B C D children. 64. Doing houseworkevery day is really boring and tired. A B C D 65. In the past, women was often passive and dependent on their husbands. A B C D 66. Women usually get less pay as men for doing the same job. A B C D

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