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\(\frac{2^{19}.27^3+15.4^9.9^4}{6^9.2^{10}+12^{10}}\)
\(=\frac{2^{19}.3^9+3.5.2^{18}.3^8}{2^{19}.3^9+3^{10}.2^{20}}\)
\(=\frac{2^{19}.3^9.\left(2+5\right)}{2^{19}.3^9.\left(1+3.2\right)}\)
\(=\frac{7}{7}\)
\(=1\)
\(\frac{2^{20}.9^3+15.4^9.81^2}{6^8.2^{11}+12^{10}}\)
\(=\frac{2^{20}.3^6+5.2^{18}.3^9}{2^{19}.3^8+2^{20}.3^{10}}\)
\(=\frac{2^{18}.3^6.\left(2^2+5.3^3\right)}{2^{19}.3^8.\left(1+2.3^2\right)}=\frac{139}{2.3^2.19}=\frac{139}{342}\)
CÔNG CHÚA ORI bạn có thể ghi bước trung gian đoạn cuối giúp mk đc ko??? Mk ko hỉu cho lắm
1)a)34-26-54=81-64-625=-608
ko hiểu b
2)a)(3x-1)2=(5/6)2=(-5/6)2
+)3x-1=5/6 =>x=11/18
+)3x-1=-5/6 =>x=1/18
b)(x+7)x-11(1-(x-7)23)=0
=>+)(x+7)x-11=0 =>x+7=0 =>x=-7
+)1-(x+7)23=0 =>(x+7)23=1 =>x+7=1 =>x=-6
- Đặt \(A=\frac{8^4.3^5-4^6.9^3}{4^6.9^3+4^8.3^5}\)
- Ta có: \(A=\frac{\left(2^3\right)^4.3^5-\left(2^2\right)^6.\left(3^2\right)^3}{\left(2^2\right)^6.\left(3^2\right)^3+\left(2^2\right)^8.3^5}\)
\(\Leftrightarrow A=\frac{2^{12}.3^5-2^{12}.3^6}{2^{12}.3^6+2^{16}.3^5}\)
\(\Leftrightarrow A=\frac{2^{12}.3^5.\left(1-3\right)}{2^{12}.3^5.\left(3+2^4\right)}\)
\(\Leftrightarrow A=\frac{-2}{3+16}\)
\(\Leftrightarrow A=-\frac{2}{19}\)
Vậy \(A=-\frac{2}{19}\)
Ta có: \(\frac{9^3.8^7}{6^9.16^2}=\frac{\left(3^2\right)^3.\left(2^3\right)^7}{2^9.3^9.\left(2^4\right)^2}\)=\(\frac{3^6.2^{21}}{2^9.3^9.2^8}=\frac{3^6.2^{21}}{2^{17}.3^9}=\frac{16}{27}\)
\(\frac{^{9^3}.^{^{8^7}}}{^{ }6^9.^{ }16^9}=\frac{729.2097152}{10077696.256}=\frac{1528823808}{2579890176}=\frac{16}{27}\)
=\(\left(9\right)^4.\left(-9\right):9^4+\left(2+3\right)^{10}\)
= \(-9+9765625\)
=9765616