giúp mik câu 1 vs 2
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Khách
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BP
4
BP
6
DN
1
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
4 tháng 11 2023
2\(xy\) + 6 + \(x\) + 3 = 2024
2\(xy\) + \(x\) + 9 = 2024
2\(xy\) + \(x\) = 2024 - 9
2\(xy\) + \(x\) = 2015
\(x\).(2y + 1) = 2015
\(x\) = 2015 : (2y + 1)
\(x\in\) Z ⇒ 2y + 1 \(\in\) Ư(2015) = { 1; 5; 13; 65; 31;155; 403;2015}
Lập bảng ta có:
| 2y + 1 | 1 | 5 | 13 | 65 | 31 | 155 | 403 | 2015 |
| y | 0 | 2 | 6 | 32 | 15 | 77 | 201 | 1007 |
| \(x\) | 2015 | 403 | 155 | 31 | 65 | 13 | 5 | 1 |
| (\(x\); y) | (2015;0) | (403;2) | (155;6) | (31;32) | (65;15) | (13;77) | (5;201) | (1;1007) |
SV
Sinh Viên NEU
CTVVIP
4 tháng 11 2023
V. Tìm lỗi sai trong câu và sửa lại cho đúng với thì hiện tại tiếp diễn.
1. We are listen=> listening to music in the car right now.
2. They not => are not studying for the exam at the moment.
3. He is playing volleyball with his friends in the park.
4. Is => are you watching TV now.
5. The students are attend=> attending the class today.
6. Are he play=> is he playing video games at the moment?
7. He read=> is reading a book in his room this evening.
8. She not => doesn't listen to the teacher in the classroom.
9. My aunt have => has been buying some fruits at the flea market.
10. I did not drinking=> drink beer; it's only tea.
11. All of Andy's friends having => are having fun at the party right now.
12. The children play => are playing football in the back yard at the moment.
13. Look! Those people are fight => fighting with each other.
14. Look! Someone is jump => jumping from the bridge.
15. My English speaking skill improving=> has improved thanks to Elsa Speak.
16. My mother is busy today. She is cook=> cooking dinner.
17. What kind of clothes are children wear => wearing nowadays?
18. They are try => tryingto pass the examination.
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
4 tháng 11 2023
0,25m2= 25dm2= 2500cm2
1,075m2= 107,5dm2= 10 750cm2 khác 1075cm2 (Ý 2 sai)
4,3m2= 430dm2= 43 000cm2 (Ý 3 đúng)
GN
GV Nguyễn Trần Thành Đạt
Giáo viên
4 tháng 11 2023
Lượng dầu có: 20 x 60 = 1200(lít)
Lượng dầu đó đựng thùng loại 30 lít thì cần: 1200:30 = 40 (thùng)
Đ.số: 40 thùng
Câu 1:
a. $132-468-(-215)=132-468+215=(132+215)-468$
$=347-468=-121$
b.
$(144-97)-156=47-156=-109$
c.
$(-145)-(18-145)=-145-18+145=(-145+145)-18=0-18=-18$
d.
$115+(-15+27)=115-15+27=100+27=127$
e.
$(24+614)-(386-76)=638-310=328$
Câu 2:
a.
$(-105)+x=-217$
$x-105=-217$
$x=-217+105=-112$
b.
$x-67=-23$
$x=-23+67=44$
c.
$4(3-x)=28$
$3-x=28:4=7$
$x=3-7=-4$
d.
$5[x+(-81)]=400$
$x-81=400:5=80$
$x=80+81=161$
e.
$140:(x+108)=7$
$x+108=140:7=20$
$x=20-108=-88$
f.
$-27+(-x)=-104$
$-28-x=-104$
$x=-28-(-104)=-28+104=76$