\(6=2.3\\ 8=2^3\\ 10=2.5\\ \Rightarrow BCNN\left(6;8;10\right)=2^3.3.5=8.3.5=120\)

\(9=3^2\\ 24=2^3\\ 35=5.7\\ \Rightarrow BCNN\left(9;24;35\right)=2^3.3^2.5.7=8.9.5.7=2520\)

\(18=2.3^2\\ 24=2^3.3\\ 30=2.3.5\\ \Rightarrow BCNN\left(18;24;30\right)=2^3.3^2.5=8.9.5=360\)

Ta có:

\(14=2.7\\ 21=3.7\\ 56=2^3.7\\ \Rightarrow BCNN\left(14;21;56\right)=2^3.3.7=8.3.7=24.7=168\)

a,Ta có:

\(54=2.3^3\\ 36=2^2.3^2\\ \RightarrowƯCLN\left(54;36\right)=2.3^2=2.9=18\)

\(\RightarrowƯC\left(54;36\right)=Ư\left(18\right)=\left\{\pm1;\pm2;\pm3;\pm6;\pm9;\pm18\right\}\)

b,Ta có:

\(65=5.13\\ 125=5^3\\ \RightarrowƯCLN\left(65;125\right)=5\\ \RightarrowƯC\left(65;125\right)=Ư\left(5\right)=\left\{\pm1;\pm5\right\}\)

A

\(25+\left(9x-5\right):2=3^3\\ \Rightarrow25+\left(9x-5\right):2=27\\ \Rightarrow\left(9x-5\right):2=27-25=2\\ \Rightarrow9x-5=2.2=4\\ \Rightarrow9x=4+5=9\\ \Rightarrow x=9:9=1\)

\(b,2.3^2+24:6.2\\=2.9+4.2\\ =18+8=26\)

\(c,2.3^x-24:\left(6.2\right)\\ =2.3^x-24:12\\ =2.3^x-2\\ =2\left(3^x-1\right)\)

\(a,6+4x=26\\ \Rightarrow4x=26-6=20\\ \Rightarrow x=20:4=5\)

\(b,27+4x=107\\ \Rightarrow4x=107-27=80\\ \Rightarrow x=80:4=20\)

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