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1.
a) \(3^4\times3^5\times3^6=3^{4+5+6}=3^{15}\)
b) \(5^2\times5^4\times5^5\times25=5^2\times5^4\times5^5\times5^2=5^{2+4+5+2}=5^{13}\)
c) \(10^8\div10^3=10^{8-3}=10^5\)
d) \(a^7\div a^2=a^{7-2}=a^5\)
2.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
\(a,81^3\cdot\frac{1}{9^2}:3^3=\left(9^2\right)^3\cdot\frac{1}{9^2}:3^3=9^6\cdot\frac{1}{9^2}\cdot\frac{1}{3^3}=\frac{9^6}{9^2}\cdot\frac{1}{3^3}=9^4\cdot\frac{1}{3^3}=\left(3^2\right)^4\cdot\frac{1}{3^3}=\frac{3^8}{3^3}=3^5\)
\(b,625^4:25^2=\left(5^4\right)^4:\left(5^2\right)^2=5^{16}:5^4=5^{12}\)
a) \(8^4.16^5\)
\(=\left(2^3\right)^4.\left(2^4\right)^5\\ =2^{3.4}.2^{4.5}\\ =2^{12}.2^{20}\\ =2^{12+20}\\ =2^{32}\)
b) \(5^{40}.125^2.625^3\)
\(=5^{40}.\left(5^3\right)^2.\left(5^4\right)^3\)
\(=5^{40}.5^{3.2}.5^{4.3}\)
\(=5^{40}.5^6.5^{12}\)
\(=5^{40+6+12}\)
\(=5^{58}\)
c) \(27^4.81^{10}\)
\(=\left(3^3\right)^4.\left(3^4\right)^{10}\)
\(=3^{3.4}.3^{4.10}\)
\(=3^{12}.3^{40}\)
\(=3^{52}\)
d) \(10^3.100^5.1000^4\)
\(=10^3.\left(10^2\right)^5.\left(10^3\right)^4\)
\(=10^3.10^{2.5}.10^{3.4}\)
\(=10^3.10^{10}.10^{12}\)
\(=10^{3+10+12}\)
\(=10^{25}\)
a/ (26.16) :42
=(26.22) :(22)2
=28 : 24=24=16
b/ (510:625) : 25
= (510:54) :52
=56 : 52=53=625
c/ (81.243):3
= (34.35) :3
= 39 :3=38 =6561