x + 1/99 + x + 4 / 95 + x + 7 / 93 + x + 9 / 91 + 4 = 0. Mn giúp em với ạ.
\(\dfrac{x+1}{99}+\dfrac{x+4}{96}+\dfrac{x+7}{93}+\dfrac{x+9}{91}+4=0\) (sửa đề)
\(\Leftrightarrow\left(\dfrac{x+1}{99}+1\right)+\left(\dfrac{x+4}{96}+1\right)+\left(\dfrac{x+7}{93}+1\right)+\left(\dfrac{x+9}{91}+1\right)=0\)
\(\Leftrightarrow\dfrac{x+100}{99}+\dfrac{x+100}{96}+\dfrac{x+100}{93}+\dfrac{x+100}{91}=0\)
\(\Leftrightarrow\left(x+100\right)\left(\dfrac{1}{99}+\dfrac{1}{96}+\dfrac{1}{93}+\dfrac{1}{91}\right)=0\)
\(\Leftrightarrow x+100=0\) (vì \(\dfrac{1}{99}+\dfrac{1}{96}+\dfrac{1}{93}+\dfrac{1}{91}>0\))
\(\Leftrightarrow x=-100\)
Đúng 0
Bình luận (0)
Cách để tách cát ra khỏi hỗn hợp cát và hạt xốp trộn lẫn.
Gợi ý:Dựa vào sự khác nhau về khối lượng riêng.
Tính tỉ số của hai số biết rằng 2/3 số thứ nhất bằng 1/4 số thứ 2.
(bài luận IELTS)Nowadays,there are many people who want to be well - known to have a better and wealthier life.Do the advantages of being famous outweigh its disadantages?Give reasons for your answer and include any relevant examples from your own knowledge or experience.Write at least 250 wordsgiúp mình với ạa!!Mình cần gấp ạ,mình cảm ơn ạ
Đọc tiếp
(bài luận IELTS)
Nowadays,there are many people who want to be well - known to have a better and wealthier life.Do the advantages of being famous outweigh its disadantages?Give reasons for your answer and include any relevant examples from your own knowledge or experience.
Write at least 250 words
giúp mình với ạa!!Mình cần gấp ạ,mình cảm ơn ạ
Trên tia Oy lấy các điểm C và D sao cho OC=2cm, OD=4cm
a,Trong ba điểm C,O,D điểm nào nằm giữa hai điểm còn lại? Vì sao?
b, Tính độ dài đoạn thẳng CD
c, Chứng tỏ C là trung điểm của OD
d, Vẽ tia Ox là tia đối của tia Oy. Trên tia Ox lấy điểm N sao cho ON=2cm, lấy điểm M sao cho N là trung điểm của OM. Chứng tỏ O là trung điểm của MD
viết 1 báo cáo ngắn về 1 thiên tai thường xảy ra trên đại bàn tỉnh Lạng Sơn
thế nào là nhiên liệu và năng lượng tái tạo? kể tên hai loại nhiên liệu và năng lương tái tạo
she didnt eat much. She was hungry (but)he got wet. he forgot his umbrella (therefore)we are saving money. we want to buy a new house (so)it got dark. they continue to work (but)she wears glasses. she wants to see better (because)we didnt enjoy our holiday. the weather was had (so)we dont use the car very often, we have decided to sell it (because)the house was empty. we left a note on the door (so)the train arrived. lan was having luch (while)i leanred a lot about wildlife. i visited Cue Phuong...
Đọc tiếp
she didn't eat much. She was hungry (but)
he got wet. he forgot his umbrella (therefore)
we are saving money. we want to buy a new house (so)
it got dark. they continue to work (but)
she wears glasses. she wants to see better (because)
we didn't enjoy our holiday. the weather was had (so)
we don't use the car very often, we have decided to sell it (because)
the house was empty. we left a note on the door (so)
the train arrived. lan was having luch (while)
i leanred a lot about wildlife. i visited Cue Phuong National Park yesterday (after)
your parents come back. you should wait here (until)
i go to bed. i usually drink a glass of warm milk (before)
he came to my house. he came to my house (when)
she will pick her children up. she goes home (before)
cái này là thêm từ nối vào câu đúng không bạn ơi ?
Đúng 0
Bình luận (0)