x^2 : m^2 : m^2. Cíu em. Mai cô ktr=(
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14 tháng 3 2023
\(\dfrac{2x+3}{3}=\dfrac{3y-2}{6}=\dfrac{2x+6y-1}{5x}\left(1\right)\)
Từ `2` tỉ số đầu , ta áp dụng t/c của DTSBN , ta đc :
\(\dfrac{2x+3}{3}=\dfrac{3y-2}{6}=\dfrac{2x+3+3y-2}{3+6}=\dfrac{2x+3y+1}{9}\left(2\right)\)
Từ `(1);(2)=>`\(\dfrac{2x+6y-1}{5x}=\dfrac{2x+3y+1}{9}\left(3\right)\)
Từ `(3)` ta xét `2` trường hợp :
+, Nếu `2x+3y+1 \ne 0` thì :
`(3)=>5x=9=>x=9/5`
Thay `x=9/5` vào \(\dfrac{2x+3}{3}=\dfrac{3y-2}{6}\), ta đc :
\(\dfrac{2\cdot\dfrac{9}{5}+3}{3}=\dfrac{3y-2}{6}\\ \Rightarrow\dfrac{\dfrac{18}{5}+3}{3}=\dfrac{3y-2}{6}\\ \Rightarrow\dfrac{11}{5}=\dfrac{3y-2}{6}\\ 3y-2=6\cdot\dfrac{11}{5}\\ 3y-2=\dfrac{66}{5}\\ 3y=\dfrac{76}{5}\\ y=\dfrac{76}{16}\)
+, Nếu `2x+3y+1=0` thì :
`(1)=>` \(\dfrac{2x+3}{3}=\dfrac{3y-2}{6}=0\\ \Rightarrow\left\{{}\begin{matrix}2x+3=0\\3y-2=0\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=-\dfrac{3}{2}\\y=\dfrac{2}{3}\end{matrix}\right.\)
22 tháng 3 2023
Ta có thể giải bài này theo 2 cách sau:
Cách 1: Để tạo thành một đoạn thẳng thì cần 2 điểm.
Để chọn điểm đầu ta có 101 cách chọn từ 101 điểm.
Để chọn điểm thứ 2 ta có 100 cách chọn.
Với 1 đoạn thẳng ta có 2 cách chọn, ví dụ chọn AB hoặc BA đều giống nhau.
Do đó số đoạn thẳng tạo thành từ 101 điểm này là:
101 x 100 : 2 = 5050 (đoạn thẳng).
Cách 2:
Giả sử ta đánh dấu 101 điểm này bằng số thứ tự từ 1 đến 101.
Chọn điểm đầu là điểm số 1, điểm thứ 2 sẽ có 100 cách chọn. Ta có 100 đoạn thẳng.
Chọn điểm đầu là điểm số 2 thì sẽ có 99 cách chọn điểm thứ 2. Có 99 đoạn thẳng trong trường hợp này.
Làm tương tự tới điểm đầu là điểm số 100, điểm thứ 2 là diểm số 101. Có 1 đoạn thẳng được tạo thành.
Tổng số đoạn thẳng được tạo thành từ 101 điểm này là:
1 +2 +3 + ... + 100 = (1+ 100)/2 x 100 = 5050( đoạn thẳng)
2
AH
Akai Haruma
Giáo viên
3 tháng 5 2023
Lời giải:
Điều kiện: $x\neq 0; -1$
$\frac{x+3}{x+1}-2=\frac{1-x}{x}$
$1+\frac{2}{x+1}-2=\frac{1}{x}-1$
$\frac{2}{x+1}-1=\frac{1}{x}-1$
$\frac{2}{x+1}=\frac{1}{x}$
$\Rightarrow 2x=x+1$
$\Leftrightarrow x=1$ (thỏa mãn)
25 tháng 3 2023
a: \(M=\dfrac{x^2+2x+1-x^2-3}{2\left(x-1\right)\left(x+1\right)}=\dfrac{2\left(x-1\right)}{2\left(x-1\right)\left(x+1\right)}=\dfrac{1}{x+1}\)
b: x thuộc {0;0,5}
=>x=0 hoặc x=0,5
Khi x=0 thì M=1/0+1=1
Khi x=0,5 thì M=1/0,5+1=1/1,5=2/3
=>M min=2/3 và M max=1
16 tháng 2 2022
Tham khảo: Harry Potter is one of my favourite movie. This movie becoming my favourite since it has been held on theatre eight years ago. In my opinion, the story is totally awesome. Based on the best seller novel by JK.Rowling, this movie becomes real. I mean that the story is fiction, but it looks real when we see the movie. This movie story tells about Harry Potter, he is a wizard child since he was a baby, but his parents died by the hand of The Dark wizard,Voldemort. So, he had to struggled on his whole life. When he turned to a young boy, Hogwart school of wizard and wizardry sent him a message that he is a student of that school. In there, he learned everything about magic, and also he found his true friendship, Hermione Granger and Ron Weasley. They always helped Harry Potter in everything, whether is right or wrong. They do this all together, happiness or sorrow. Harry Potter also learned how to love his parents, friends, teachers, and everything. When Voldemort comes to kill Harry Potter, Harry against hard to be win. His bestfriend helped him until they comes to chaotic, but they still hold out. With his witchcraft power, his friends help, and their corageous, voldemort got lost. From the story, i learn something about love, friendship, against everything bad, with our courageous and our heart and soul. That's why this movie becoming my favourite ever, because the story is touching, even it's just a fiction story. But it doesn't mind, because we get everything in this movie, the great adventure, and the philosophy of this movie, definitely Harry Potter is my favourite.
16 tháng 2 2022
TK
Harry Potter is one of my favourite movie. This movie becoming my favourite since it has been held on theatre eight years ago. In my opinion, the story is totally awesome. Based on the best seller novel by JK.Rowling, this movie becomes real. I mean that the story is fiction, but it looks real when we see the movie. This movie story tells about Harry Potter, he is a wizard child since he was a baby, but his parents died by the hand of The Dark wizard,Voldemort. So, he had to struggled on his whole life. When he turned to a young boy, Hogwart school of wizard and wizardry sent him a message that he is a student of that school. In there, he learned everything about magic, and also he found his true friendship, Hermione Granger and Ron Weasley. They always helped Harry Potter in everything, whether is right or wrong. They do this all together, happiness or sorrow. Harry Potter also learned how to love his parents, friends, teachers, and everything. When Voldemort comes to kill Harry Potter, Harry against hard to be win. His bestfriend helped him until they comes to chaotic, but they still hold out. With his witchcraft power, his friends help, and their corageous, voldemort got lost. From the story, i learn something about love, friendship, against everything bad, with our courageous and our heart and soul. That's why this movie becoming my favourite ever, because the story is touching, even it's just a fiction story. But it doesn't mind, because we get everything in this movie, the great adventure, and the philosophy of this movie, definitely Harry Potter is my favourite.
KV
8 tháng 8 2023
Do 9 và 3 đều chia hết cho 3 nên tổng số điểm phải chia hết cho 3
Mà số 209 không chia hết cho 3
Nên Mai tính sai
Đề bài?
3