Toán Lớp 6: 5.(2².3²)⁹.(2²)⁶-2.(2².3)¹⁴.3⁴/5.2²⁸.3¹⁸-7.2²⁹.3¹⁸
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Toán Lớp 6: 5.(2².3²)⁹.(2²)⁶-2.(2².3)¹⁴.3⁴/5.2²⁸.3¹⁸-7.2²⁹.3¹⁸
Comments ( 2 )
\dfrac{{5.{{\left( {{2^2}{{.3}^2}} \right)}^9}.{{\left( {{2^2}} \right)}^6} – 2.{{\left( {{2^2}.3} \right)}^{14}}{{.3}^4}}}{{{{5.2}^{28}}{{.3}^{18}} – {{7.2}^{29}}{{.3}^{18}}}}\\
= \dfrac{{{{5.2}^{18}}{{.3}^{18}}{{.2}^{12}} – {{2.2}^{28}}{{.3}^{14}}{{.3}^4}}}{{{2^{28}}{{.3}^{18}}.\left( {5 – 7.2} \right)}}\\
= \dfrac{{{{5.2}^{30}}{{.3}^{18}} – {2^{29}}{{.3}^{18}}}}{{{2^{28}}{{.3}^{18}}.\left( { – 9} \right)}}\\
= \dfrac{{{2^{29}}{{.3}^{18}}.\left( {5.2 – 1} \right)}}{{{2^{28}}{{.3}^{18}}.\left( { – 9} \right)}}\\
= \dfrac{{2.9}}{{\left( { – 9} \right)}}\\
= – 2
\end{array}$