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\(a.\frac{2^{78}+2^{79}+2^{80}}{2^{77}+2^{76}+2^{75}}=2+2^3+2^5=2+8+32=42\)
chúc bạn học tốt 
(722+721+720) : (25+24+32)
=(720.72+720.7+720) : (24.2+24+32)
=[ 720.(72+7+1)] : [24.(2+1)+9]
=(720.57) : (16.3+9)
=(720.57) : (16.3+3.3)
=(720.57) : (3.19)
=\(\frac{7^{20}.57}{3.19}\)
=\(\frac{7^{20}.3.19}{3.19}\)
= 720
\(\left(\frac{3}{7}+\frac{1}{2}\right)^2=\left(\frac{13}{14}\right)^2=\frac{169}{196}\)
\(\frac{5^4\cdot20^4}{25^5\cdot4^5}=\frac{5^4\cdot4^4\cdot5^4}{5^5\cdot5^5.4^5}=\frac{1}{100}\)
\(\left(\frac{3}{7}\right)^{21}:\left(\frac{9}{49}\right)^6=\left(\frac{3}{7}\right)^{21}:\left[\left(\frac{3}{7}\right)^2\right]^6=\left(\frac{3}{7}\right)^{21}:\left(\frac{3}{7}\right)^{12}=\left(\frac{3}{7}\right)^9\)
\(3-\left(-\frac{6}{7}\right)^0+\left(\frac{1}{2}\right)^2:2\)
\(=3-1+\frac{1}{4}:2=3-1+\frac{1}{8}=\frac{17}{8}\)
\(\frac{5^{56}+5^7}{5^{49}+1}=\frac{5^7\left(5^{49}+1\right)}{5^{49}+1}=5^7\)
\(\frac{5^{56}+5^7}{5^{49}+1}=\frac{5^5+5^7}{1}=5^5+5^7=3125+78125=81250\)
a) (556+57):(549+1)=57(549+1):(549+1)=57