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\(a,5^{200}:5^{13}=5^{200-13}=5^{187}\)
\(b,7^{2001}:7=7^{2001-1}=7^{2000}\)
\(c,16^{137}:4^2=16^{137}:16=16^{137-1}=16^{136}\)
\(d,\left(2^{48}\cdot2^5\right):\left(2^3\cdot2^{17}\right)=2^{48+5}:2^{3+17}=2^{53}:2^{10}=2^{53-10}=2^{43}\)
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.
\(987=900+80+7\\ =9\times100+8\times10+7\\ =9\times10^2+8\times10^1+7\times10^0\)
\(2021=2000+20+1\\ =2\times1000+2\times10+1\times1\\ =2\times10^3+2\times10^1+1\times10^0\)
\(abcde=a\times10000+b\times1000+c\times100+d\times10+e\times1\\ =a\times10^4+b\times10^3+c\times10^2+d\times10^1+e\times10^0\)
5^177
7^2000
16^136
\(5^{200}:5^{23}=5^{200-23}=5^{177}\)
\(7^{2001}:7=7^{2001-1}=7^{2000}\)
\(16^{137}:4^2=16^{137}:16=16^{137-1}=16^{136}\)