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a, \(A=2015.20162016-2016.20152015\)
\(A=2015.\left(2016.10001\right)-2016.20152015\)
\(A=\left(2015.10001\right).2016-20152015.2016\)
\(A=20152015.2016-20152015.2016\)
\(A=0\)
Vậy A = 0
b, \(B=\left(3.4.2^{16}\right)^2\div11.2^{13}.4^{11}-16^9\)
\(B=3^2.2^4.2^{32}\div11.2^{13}.\left(2^2\right)^{11}-\left(2^4\right)^9\)
\(B=3^2.2^4.2^{32}\div11.2^{13}.2^{22}-2^{36}\)
\(B=3^2.2^{36}\div11.2^{35}-2^{36}\)
\(B=3^2.2^{35}.2\div11.2^{35}-2.2^{35}\)
\(B=3^2.2\div9=9.2\div9=2\)
Vậy B = 2
c, \(C=2^{10}.13+2^{10}.65\div2^8.104\)
\(C=2^{10}.\left(13+65\right)\div2^8.104\)
\(C=2^{10}.78\div2^8.104\)
\(C=2^{10}.39\div2^8.13\)
\(C=39\div13=3\)
Vậy C = 3
Đề bài câu c sai mk sửa nhé là 28 ms tính đc k nó dư lắm !!!
\(A=\frac{72^3\times54^2}{108^4}\)
\(\Rightarrow A=\frac{\left(2^3\times3^2\right)^3\times54^2}{\left(54\times2\right)^4}\)
\(\Rightarrow A=\frac{\left(2^3\right)^3\times\left(3^2\right)^3\times54^2}{54^4\times2^4}\)
\(\Rightarrow A=\frac{2^9\times3^6\times54^2}{54^2\times54^2\times2^4}\)
\(\Rightarrow A=\frac{2^5\times3^6}{54^2}\)
\(\Rightarrow A=\frac{2^5\times3^6}{\left(2\times3^3\right)^2}\)
\(\Rightarrow A=\frac{2^2\times2^3\times3^6}{2^2\times\left(3^3\right)^2}\)
\(\Rightarrow A=\frac{2^3\times3^6}{3^6}\)
\(\Rightarrow A=2^3=8\)
\(B=\frac{3^{10}\times11+3^{10}\times5}{3^9\times2^4}\)
\(\Rightarrow B=\frac{3^{10}\times\left(11+5\right)}{3^9\times2^4}\)
\(\Rightarrow B=\frac{3^{10}\times16}{3^9\times16}\)
\(\Rightarrow B=\frac{3^{10}}{3^9}=3\)
Lời giải:
$A=2+2^2+2^3+2^4+....+2^{108}$
$2A=2^2+2^3+2^4+2^5+...+2^{109}$
$\Rightarrow 2A-A=2^{109}-2$
$\Rightarrow A=2^{109}-2$