Giúp mik vs. Tối mik đi hok rùi. Thanks
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Giúp mik với. Tối mik đi hok rùi
28 tháng 8 2016
Bai 2 :
1.speaking
2.famous
3.entertainment
4. second
5.sunny
6.better
7.longest
8.nationality
9.electricity
10.himself
M
10
11 tháng 9 2018
I'm a ......student.......
k mk nha
Học tốt
^_^
Giúp mik vs. Tối mik đi hok rồi
LH
4
NM
Nguyễn Minh Quang
Giáo viên
4 tháng 8 2021
ta có \(\left(x+2\right)^2-2\left(x+2\right)\left(x+3\right)+\left(x+5\right)^2=7\)
\(\Leftrightarrow x^2+4x+4-2\left(x^2+5x+6\right)+x^2+10x+25=7\)
\(\Leftrightarrow4x+10=0\Leftrightarrow x=-\frac{5}{2}\)
4 tháng 8 2021
Bạn áp dụng hằng đẳng thức số 1, nhân phá ngoặc là Ok nhé
\(\left(x+2\right)^2-2\left(x+2\right)\left(x+3\right)+\left(x+5\right)^2=7\)
\(\Leftrightarrow x^2+4x+4-2\left(x^2+3x+2x+6\right)+x^2+10x+25-7=0\)
\(\Leftrightarrow2x^2+14x+22-2x^2-6x-4x-12=0\)
\(\Leftrightarrow4x+10=0\)
\(\Leftrightarrow4x=-10\)
\(\Leftrightarrow x=\frac{-5}{2}\)
1. I have written the letter for 2 days
2.My father hasn't drunk wine for a year
3.She hasn't read a newspaper since May12
4.Jack has been a reporter since 2010
5.Mary began learning English 6 years ago
6. It’s 10 years since we went to the city
7.His father began teaching 5 years ago
8.She stopped writing to John since 2008
9.The last time my ucle taught in this school was five years ago
10.It’s ages since I worked for an international bank
11.I haven't corressponded with John a long time ago
12.Linda hasn't been talked to me for many years
13.You started taking part in this
14.We last saw Maty since we left the university
15.You last helped me when you graduated from the college
16.He hasn't gone abroad before
17.She has driven for 1 month