Bài 1 : Tìm \(n\in N\)
a) \(\frac{4n-1}{3n+2}\in N\) b) \(\frac{5n-7}{2n+1}\in N\)
Bài 2 : Tìm \(n\in N\)
a) \(\left(n+2\right)\cdot\left(2n+5\right)=21\) b) \(\left(2n-3\right)\cdot\left(n-5\right)=22\)
Bài 3 : Tìm \(x.y\in N\)
a) \(\left(2n+1\right)\cdot\left(3y-5\right)=12\) b) \(\left(3x-1\right)\cdot\left(4y+3\right)=14\)
Cách bạn giải ra giúp mình nha !
1,Tìm x: a,\(\frac{x+2}{5}=\frac{1}{x-2}\) b,\(\left(x-\frac{2}{9}\right)^3=\left(\frac{2}{3}\right)^6\) c,\(\left(8x-1\right)^{2\cdot n+1}=5^{2\cdot n+1}\)
2,Tìm x,y bít: a,\(x^2+\left(y-\frac{1}{10}\right)\cdot4=0\) b,\(\left(\frac{1}{2}\cdot x-5\right)^{20}+\left(y^2-\frac{1}{4}\right)^{10}< hay=0\)
Làm giúp cấy nha, tui ko làm đc toán, dốt toán lắm. Sáng mai là đi học thêm zồi. Thanks bạn trước nhen :)
a) Tính
\(A=\left(1-\frac{1}{2}\right)\cdot\left(1-\frac{1}{3}\right)\cdot\left(1-\frac{1}{4}\right)\cdot\cdot\cdot\left(1-\frac{1}{2014}\right)\cdot\left(1-\frac{1}{2015}\right)\cdot\left(1-\frac{1}{2016}\right)\)
b) Tìm x:
\(\frac{x-2}{12}+\frac{x-2}{20}+\frac{x-2}{30}+\frac{x-2}{42}+\frac{x-2}{56}+\frac{x-2}{72}=\frac{16}{9}\)
\(Tìm\)\(x,y\in N\)\(thỏa\)\(mãn\)
\(a.\)\(\left(3x-2\right)\cdot\left(2y-3\right)=1\)
\(b.\)\(\left(x+1\right)\cdot\left(2y-1\right)=12\)
1Tìm x: a, \(\frac{x+2}{5}=\frac{1}{x-2}\) b.\(\left(x-\frac{2}{9}\right)^3=\left(\frac{2}{3}\right)^6\) c,\(\left(8x-1\right)^{2\cdot n+1}=5^{2\cdot n+1}\)
2Tìm x,y biết a,:\(x^2+\left(y-\frac{1}{10}\right)\cdot4=0\) b,\(\left(\frac{1}{2}\cdot x-5\right)^{20}+\left(y^2-\frac{1}{4}\right)^{10}< or=0\)
Ai làm cái, tui đang vội lắm giúp tui nha. Thanks trước :D nhanh thì tui tick lun
Tìm x , y \(\in Z\)biết :
a) \(\left(x+1\right)\cdot\left(y-2\right)=0\)
b) \(\left(x+4\right)\cdot\left(y-2\right)=2\)
c) \(x\cdot y+5\cdot x+y=4\)
d) \(3\cdot x+4\cdot y-x\cdot y=15\)
Bài 1: Tìm x,y thuộc z:
a) \(8⋮\left(n+2\right)\)
b)\(\left(x-1\right)\left(y+2\right)=5\)
c)\(x\left(2y-1\right)=12\)
Chứng minh rằng
\(\frac{1\cdot3\cdot5\cdot\cdot\cdot\left(2n-1\right)}{\left(n+1\right)\cdot\left(n+2\right)\cdot\left(n+3\right)\cdot...\cdot2n}=\frac{1}{2^n}\)
tìm x
a) \(\frac{x-1}{2}+\frac{x-2}{5}=\frac{1}{4}+\frac{x-7}{10}\)
b) \(3-\frac{2}{2x-3}=\frac{2}{5}+\frac{1}{2x-3}-\frac{3}{2}\)
c)\(7\cdot\left(x-1\right)+2x\cdot\left(1-x\right)=0\)
d) \(\frac{x+1}{2008}+\frac{x+2}{2017}+\frac{x+3}{2016}=\frac{x+10}{2009}+\frac{x+11}{2008}+\frac{x+12}{2007}\)
e) \(\frac{2}{\left(x-1\right)\cdot\left(x-3\right)}+\frac{5}{\left(x-3\right)\cdot\left(x-8\right)}+\frac{12}{\left(x-8\right)\cdot\left(x-20\right)}-\frac{1}{x-20}=\frac{-3}{4}\)
