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Ta có: 2x+1=8
Mà (2x+1)^2= 4x+1
=) 4x+1= 8^2=64
Vậy 4x+1= 64, mình làm bừa à.
a) Ta có : \(y=\sqrt{2-m}\left(x+1\right)\)
\(=x\sqrt{2-m}+\sqrt{2-m}\)
Để \(y\) là hàm số bậc nhất \(\Leftrightarrow\sqrt{2-m}\ne0\)
\(\Leftrightarrow m\ne4\)
b) Ta có : \(y=\frac{\sqrt{m-5}}{\sqrt{m+5}}x+\sqrt{2}\)
Để \(y\) là hàm số bậc nhất \(\Leftrightarrow\frac{\sqrt{m-5}}{\sqrt{m+5}}\ne0\)
\(\Leftrightarrow\hept{\begin{cases}\frac{m-5}{m+5}\ne0\\m\ne-5\end{cases}}\) \(\Leftrightarrow m\ne\pm5\)
( 2m - 3 )( 3n - 2 ) - ( 3m - 2 )( 2n - 3 )
= 6mn - 4m - 9n + 6 - ( 6mn - 9m - 4n + 6 )
= 6mn - 4m - 9n + 6 - 6mn + 9m + 4n - 6
= 5m - 5n
= 5( m - n ) \(⋮\)5 với mọi m, n thuộc Z ( đpcm )
a) Thay \(x=25\)vào B:
=> \(B=\frac{2}{\sqrt{25}-6}=\frac{2}{5-6}=\frac{2}{-1}=-2\)
b); c) Bạn quy đồng mẫu số là ra A; Ra luôn P nhé
Ta nhận thấy vế trái có 100 số hạng
=> \(\left(x+x+...+x\right)+\left(1+2+...+100\right)=5500\)
<=> \(100x+\frac{100.101}{2}=5500\)
<=> \(100x+5050=5500\)
<=> \(x=4,5\)
\(\left(x+1\right)+\left(x+2\right)+\left(x+3\right)+...+\left(x+100\right)=5550\)
\(< =>x+1+x+2+x+3+...+x+100=5550\)
\(< =>100x+\frac{100\left(100+1\right)}{2}=5550\)
\(< =>100x+\frac{10100}{2}=5550\)
\(< =>100x+5050=5550\)
\(< =>100x=500< =>x=\frac{500}{100}=5\)
ARRANGE
1 House / is / the market / far / to / from / how / it / Trang's=) how far is it from your Trang's house to the market?
2 lives / street / grandparents / he / Hoang Quoc Viet / his / on / with=) He lives with his grandparents on Hoang Quoc Viet street
3 many / old / students / my / have / doesn't / class=) My class doesn't have many old students
4 smaller / new / old / her / Hoa's / one / school / is / than=) Hoa's old school is smaller than new one.
5 gose / bus / Hoang / day / work / Mrs / every / to / day=) Mrs. Hoang goes to bus to work every day new one?
6 new / from / one / is / house / his / how/ different/ Minh's/ old?=) How is Minh's old house different from new one?
7 because /parents/ is/ she/ Nguyet/ misses/ unhappy/ her=) Nguyet is unhappy because she misses her parents.
8 friends /town/ lot/ does/ her /Nhung/ of/ in /a/ have?=) Does Nhung have a lot of friends in her town?
Helping others and caring for them is a noble gesture and reflect one's humanity. I have helped many people in my life with various things. I think it to be the best thing that I can do give back to the world and make it a better place to live.
One such time was when I helped a small child with his studies, specifically his exam, our maid brought her son along with her so that she could keep an eye on him while he studied. He was in the fifth standard and was a weak student causing his mother to be worried about him. I called him up to my study table and looked at his books. With her permission, I sat down to guide him through his course mateial, one subject after the other. After two hours, we both were tired and I asked him to come to me daily from the next day. His mid-term examinations were due in a month and I decied to tutor him for two hours each day till then. I followed a set timetable dedicating time to each subject. I taught him all the important chapters, cleared his doubts, and gave him homework and a lot of questions for his prace.
He slowly and steadily gained confidance and performed well in his exam. All I did was to help him become focused and prace to become adept at learning and answering questions. He thanked me a lot and I was glad that I could help him with his studies.