\(j,=3119\left(121-11\cdot11\right)=0\\ k,=\left(123+87\right)\left(24+76\right)=210\cdot100=21000\\ l,=1015\\ m,=21762\\ n,=119976\)
Bài 5:
\(a,\Rightarrow\overline{80x}-801=0\Rightarrow\overline{80x}=801\Rightarrow x=1\\ b,\Rightarrow\overline{x1}-10=1\Rightarrow\overline{x1}=11\Rightarrow x=1\\ c,\Rightarrow x^2=16\Rightarrow\left[{}\begin{matrix}x=4\\x=-4\end{matrix}\right.\\ d,\Rightarrow\overline{xx}+\overline{xx}\in R\\ \Rightarrow x\in R\)
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