Giúp em lẹ 21h hết hạn
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DC
2
AH
Akai Haruma
Giáo viên
13 tháng 1 2022
Lời giải:
a. Từ PT (2) $\Rightarrow y=3x-5$. Thay vô PT (1) thì:
$2x+3(3x-5)=7$
$\Leftrightarrow 11x-15=7$
$\Leftrightarrow 11x=22\Leftrightarrow x=2$
$y=3x-5=3.2-5=1$
Vậy hpt có nghiệm $(x,y)=(2,1)$
Các câu sau bạn làm tương tự.
10 tháng 11 2021
Tham khảo!
https://mobitool.net/top-10-bai-van-bieu-cam-ve-loai-cay-em-yeu.html
Bạn bôi đen dòng chữ ở trên rồi mở nhé!
VK
1
3 tháng 8 2018
Số các số hạnh là : ( 197 - 1 ) : 2 + 1 = 100 ( số )
Tổng là : ( 197 + 1 ) x 100 : 2 = 9900
Học tốt~
NN
27 tháng 7 2021
48. My brother whose house was broken in called the police.
49. Mary was too very tired to study more.
50.If Emily wasn't sick today, she could go to school.
51.Although my grandparents are very busy, they spend a lot of time taking care of us.
52. The floor hasn't been cleaned yet.
53.We haven't seen our grandfather for five month.
54. I wish I could remember the answers to these questions.
55. I spent three hours cleaning the house yesterday.
TC
27 tháng 7 2021
P8. 48.My brother whose house was broken in called the police.
49. Mary was too tired to study.
50. If Emily wasn't sick today, she could go to school.
51. Although my grandparents are very busy, they spend a lot of time taking care of us.
P9. 52. The floor hasn't been cleaned yet.
53.We haven't seen our grandfaather for five months.
54. I wish I could remember the answer to these questions.
55. I spent three hours cleaning the house yesterday.
