tính giá trị biểu thức
\(5.4^{15}.9^9-4.3^{20}.8^9\)
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5.415.99-4.320.89
=5.230.318-22.320.227
=229.318(10-9)
=229.318
5.4^15 . 9^9 - 4.3^20 .8^9
= 5.2^30.3^18 - 2^2. 3^20.2^27
=5.2^30.3^18 - 2^29.3^20
=2^29.3^18.(5.2 - 3^2)
=2^29. 3^18. 1
=2^29.3^18
Phân tích ra bình thường pạn ạ
5.4^15.9^9-4.3^20.8^9
5.2^9.6^19-7.2^29.27^6
= 5.2^30.3^18-2^2.3^20.2^27
5.2^9.2^19.3^19-7.2^29.3^18
= 2^29.3^18(5.2-3^2)
2^28.3^18(5.3-7.2)
= 2^29.3^18
2^28.3^18
=2
Cái 4^15=2^30 là 4^15=(2^2)^15= 4^15
Những cái sau Tương tự pạn nhé
\(B=\frac{5.4^{15}.9^9-4.3^{20}.8^9}{5.2^9.6^{19}-7.2^{29}.27^6}\)
\(=\frac{5.2^{30}.3^{18}-2^2.3^{20}.2^{27}}{5.2^9.2^{19}.3^{19}-7.2^{29}.3^{18}}\)
\(=\frac{2^{29}.3^{18}\left(5.2-3^2\right)}{2^{28}.3^{18}\left(5.3-7.2\right)}\)
\(=\frac{2^{29}.3^{18}.1}{2^{28}.3^{18}.1}\)
\(=2\)
Ta có:
\(A=\frac{5.2^{30}.3^{18}-2^2.3^{20}.2^{27}}{5.2^{19}.3^{19}.2^9-7.2^{29}.3^{18}}\)
\(=\frac{5.2^{30}.3^{18}-2^{29}.3^{20}}{5.2^{28}.3^{19}-7.2^{29}.3^{18}}=\frac{2^{29}.3^{18}\left(2.5-3^2\right)}{2^{28}.3^{18}\left(5.3-7.2\right)}\)
\(=\frac{2^{29}.3^{18}}{2^{28}.3^{18}}=2\)
k nha
\(5.4^{15}.9^9-4.3^{20}.8^9\)
\(=5.\left(2^2\right)^{15}.\left(3^2\right)^9-2^2.3^{20}.\left(2^3\right)^9\)
\(=5.2^{30}.3^{18}-2^2.3^{20}.2^{27}\)
\(=5.2^{27}.2^3.3^{18}-2^2.3^{18}.3^2.2^{27}\)
\(=\left(2^{27}.3^{18}\right)\left(5.2^3-2^2.3^2\right)\)
\(=2^{27}.3^{18}.4\)
\(=\left(3^3\right)^9.\left(3^2\right)^9.4\)
\(=27^9.9^9.4\)
\(=\left(27.9\right)^9.4\)
\(=243^9.4\)