Question

tìm x E N* sao cho 11x chia hết (2x-1)

Answer 1

\(11x⋮2x-1\)

\(=>22x-\left(22x-11\right)⋮2x-1\)

\(=>11⋮2x-1\)

\(=>2x-1\inƯ\left(11\right)=\left\{-11;-1;1;11\right\}\)

\(=>2x\in\left\{-10;0;2;12\right\}\)

\(=>x\in\left\{-5;0;1;6\right\}\)

Vậy ..........

Answer 2

à nhầm. Sửa lại chỗ cuối 

Vì \(x\in\) N* nên \(x\in\left\{1;6\right\}\)