\(A=\frac{10^4\cdot81-16\cdot15^2}{4^4\cdot675}\)
\(=\frac{2^4\cdot5^4\cdot3^3-2^4\cdot3^2\cdot5^2}{2^8\cdot3^3\cdot5^2}\)
\(=\frac{2^4\cdot5^2\cdot3\left(5^2\cdot3-3\right)}{2^8\cdot3^3\cdot5^2}\)
\(=\frac{5^2\cdot3-3}{2^4\cdot3^2}\)
\(=\frac{3\cdot\left(5^2-1\right)}{2^4\cdot3^2}=\frac{24}{48}=\frac{1}{2}\)
các bạn ơi 500 nhân 687= bao nhiêu