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\(\frac{4^7}{4^{10}}\)=\(\frac{1}{4^3}\) vì 4^7 : 4^7=1;4^10:4^7=4^3
\(\frac{5^{11}}{5^8}\)=\(5^3\)vì 5^11:5^8=5^3;5^8:5^8=1
chỉ tke thui.mấy cái gạch kia bỏ đi vì mk chưa sử dụng phần mềm rành lắm
\(\frac{8^{10}+4^{10}}{8^4+4^{10}}\)
\(=\frac{\left(2^3\right)^{10}+\left(2^2\right)^{10}}{\left(2^3\right)^4+\left(2^2\right)^{10}}\)
\(=\frac{2^{30}+2^{20}}{2^{12}+2^{20}}\)
\(=\frac{2^{20}.\left(2^{10}+1\right)}{2^{12}.\left(1+2^8\right)}\)
\(=\frac{2^8.\left(2^{10}+1\right)}{1+2^8}\)
\(=\frac{262400}{257}\)
\(\frac{8^{10}+4^{10}}{8^4+4^{10}}=\frac{2^{30}+2^{20}}{2^{12}+2^{20}}=\frac{2^{12}.\left(2^{18}+2^{10}\right)}{2^{12}.\left(1+2^{10}\right)}\frac{2^{18}+2^{10}}{2^{10}+1}\)
\(\frac{2^{10}\cdot9^6}{4^6\cdot3^{11}}=\frac{2^{10}\cdot3^{12}}{2^{12}\cdot3^{11}}=\frac{3}{4}\)
\(A=\frac{8^{10}+4^{10}}{8^4+4^{11}}\\ =\frac{8^4.8^6+4^{10}}{8^4+4^{10}.4}\\ =\frac{8^6}{4}\\ =\frac{262144}{4}\\ =65536\)
1. Tìm x, biết:
a) \(\frac{4}{x}=\frac{8}{6}\). Ta có: \(\frac{8}{6}=\frac{8:2}{6:2}=\frac{4}{3}\Rightarrow x=3\)
b) \(\frac{3}{x-5}=\frac{4}{x+2}\). Ta có: \(5-2=3\)
\(\Rightarrow x=\left(3.5\right)+\left(4.2\right)+3=15+8+3=26\)
c) \(\frac{x}{-2}=\frac{-8}{x}\Rightarrow x=\left(-8\right):\left(-2\right)=4\)
2. Rút gọn
a) \(\frac{2^4.5^2.11^2.7}{2^3.5^3.7^2.11}\Leftrightarrow\frac{2^3.2^1.5^2.11.11.7}{2^3.5^2.5^1.7.7.11}\Leftrightarrow\frac{2^1.11}{5^1.7}=\frac{22}{35}\)
b) Tương tự
c) Tương tự
\(\frac{4}{x}=\frac{8}{6}\Rightarrow x=\frac{4.6}{8}=3\)
\(\frac{3}{x-5}=\frac{-4}{x+2}\Rightarrow3\left(x+2\right)=-4\left(x-5\right)\)
\(\Rightarrow3x+6=-4x+20\)
\(\Rightarrow3x+4x=20-6\)
\(\Rightarrow7x=14\)
\(\Rightarrow x=2\)
\(\frac{x}{-2}=\frac{-8}{x}\Rightarrow x^2=\left(-8\right)\left(-2\right)=16\Rightarrow x=\pm4\)