Toán Lớp 6: TÍNH GIÁ TRỊ BIỂU THỨC:
$\frac{4^5.9^4-10.6^9}{2^{10} .3^8+6^8.28}$
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Toán Lớp 6: TÍNH GIÁ TRỊ BIỂU THỨC:
$\frac{4^5.9^4-10.6^9}{2^{10} .3^8+6^8.28}$
Comments ( 2 )
\dfrac{{{4^5}{{.9}^4} – {{10.6}^9}}}{{{2^{10}}{{.3}^8} + {6^8}.28}}\\
= \dfrac{{{2^{2.5}}{{.3}^{2.4}} – {{2.5.2}^9}{{.3}^9}}}{{{2^{10}}{{.3}^8} + {2^8}{{.3}^8}{{.2}^2}.7}}\\
= \dfrac{{{2^{10}}{{.3}^8} – {2^{10}}{{.3}^9}.5}}{{{2^{10}}{{.3}^8} + {2^{10}}{{.3}^8}.7}}\\
= \dfrac{{{2^{10}}{{.3}^8}\left( {1 – 3.5} \right)}}{{{2^{10}}{{.3}^8}\left( {1 + 7} \right)}}\\
= \dfrac{{1 – 15}}{8} = – \dfrac{{14}}{8} = – \dfrac{7}{4}
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