\(x+7⋮x-3\)
\(\Leftrightarrow x-3\in\left\{1;-1;2;-2;5;10\right\}\)
hay \(x\in\left\{4;2;5;1;8;13\right\}\)
Tìm x, biết
\(a,10\left(x-7\right)-8\left(x+5\right)=6.\left(-5\right)+24\)
\(b,2\left(4x-8\right)-7\left(3+x\right)=6\)
c,\(\frac{7}{x}< \frac{x}{4}< \frac{10}{x}\left(x\in N\right)\)
tìm số dư của A, B cho 2 biết
a,\(A=\left(4^x+6^x+8^x+10^x\right)3\left(3^x+5^x+7^x+9x\right)\)
b, \(B=2003^n+2004^n+2005^n;n\in N\)
Tìm x \(\in\)Z , biết:
a)(\(\left(x-4\right).\left(x+7\right)=0\)
b)\(x.\left(x+3\right)=0\)
c)\(\left(x-2\right).\left(5-x\right)=0\)
d)\(\left(x-1\right).\left(x^2+1\right)=0\)
Tìm x biết:
f)\(32^{-x}.16^x=1024;\left(x\in N\right)\) g)\(3^{x-1}+5.3^{x-1}=162;\left(x\in N\right)\)
h)\(\left(2x-1\right)^6=\left(2x-1\right)^8\) i)\(5^x+5^{x+2}=650;\left(x\in N\right)\)
Bài 5 : tìm x \(\in N\)
\(\left(x+3\right)⋮\left(x+2\right)\)
Bài 6 : tìm x \(\in Z\)
\(\left(2x+7\right)⋮\left(x+1\right)\)
Tìm x \(\in\)Z ,biết:
a,\(\left(x+1\right)+\left(x+3\right)+...+\left(x+99\right)=0\)
b,\(\left(x-3\right)+\left(x-2\right)+\left(x-1\right)+...+10+11=11\)
TÌM X\(\in\)N biết:
\(a,\left(2x-16\right)^8-\left(2x-16\right)^3=0\)
\(b,\left(3-x\right)^{10x}:\left(3-x\right)^{10}=1\)
1.tìm \(x\in Z\) sao cho \(\dfrac{2x+1}{x+3}\) là 1 số nguyên
1.tìm \(x\in Z\) sao cho \(\dfrac{x-1}{x+5}\) là 1 số nguyên
1.tìm \(x,y\in Z\) sao cho \(\left(x-1\right).\left(y-3\right)=7\) là 1 số nguyên
tìm\(x\in z\)biết :
a.\(\frac{13}{15}-\left(\frac{13}{21}+x\right)\times\frac{7}{12}=\frac{7}{10}\)
b.\(\left(x+\frac{1}{4}-\frac{1}{3}\right)\div\left(2+\frac{1}{6}-\frac{1}{4}\right)=\frac{7}{46}\)
