so nguyen duong X thoa man 49-l-17-(-15)-Xl=-3+27
phan tu lon nhat cua tap hop cac so nguyen x thoa man l-17-xl=7
câu hỏi tick nhanh tay lên
|-17 - x | = 7
\(\Rightarrow\orbr{\begin{cases}-17-x=7\\-17-x=-7\end{cases}}\Rightarrow\orbr{\begin{cases}x=-24\\x=10\end{cases}}\)
cho 2017 so nguyen thoa man tich cua 17 so nguyen bat ki la mot so nguyen duong .chung minh 2017 so nguyen da cho deu la so nguyen duong
toan lop 6
tim so nguyen duong x,y thoa man : x^2=1!+2!+3!+....+y!
so nguyen duong x thoa man x^5=x^12
Ta có : x5 = x12
=> x5 - x12 = 0
x5 ( 1 - x7 ) = 0
=> x5 = 0 hoặc 1 - x7 = 0
+ Nếu x5 = 0 => x = 0
+ Nếu 1 - x7 = 0
=> x7 = 1 = 17
=> x = 1
Vậy : x thuộc { 0 ; 1 }
cap so nguyen duong x y thoa man x(x-2)-(2-x)y-2(x-2)=3
Tim cac so nguyen duong thoa man: 1/x+1/y=2/3
Giả sử :
\(x\le y\)(1)
=> \(\frac{1}{x}+\frac{1}{y}\ge\frac{2}{y}\)
=> \(\frac{2}{3}\ge\frac{2}{y}\)
=> \(\frac{1}{3}\ge\frac{1}{y}\Rightarrow3\ge y\)(2)
Lại có :
\(\frac{1}{x}+\frac{1}{y}\le\frac{2}{x}\)
=> \(\frac{2}{3}\le\frac{2}{x}\Rightarrow3\le x\)(3)
Từ (1) , (2) , (3)
=> \(3\le x\le y\le3\)
=> x = y = 3
tim cac so nguyen duong x;y;z thoa man \(3x^2-18y^2+2z^2+3y^2z^2-18x=27\)
so nguyen x thoa man 10+x/17+x=3/4
tim cac so nguyen duong x,y,z thoa man x^2+y^3+z^4