\(\frac{3}{4}-\frac{4}{5}=\frac{15-16}{20}=-\frac{1}{20}\).
\(\frac{1}{\frac{1}{9}-\frac{1}{12}}=\frac{1}{\frac{1}{36}}=36\).
\(0{,}4:(1-\frac{1}{5})=0{,}4:\frac{4}{5}=0{,}5\).
\((6{,}9-1{,}5):2{,}4=5{,}4:2{,}4=2{,}25\).
\((5{,}6\cdot0{,}3):0{,}8=1{,}68:0{,}8=2{,}1\).
\(\frac{(7^6)^5}{(7^7)^4}=7^{30-28}=49\).
\(\frac{5^9\cdot3^{12}}{3^6\cdot5^6}=5^3\cdot3^6=91125\).
\(4^4:64=256:64=4\).
\(3^{-4-8-(-14)}=3^2=9\).
\(5^{-12-(-11)}=5^{-1}=\frac{1}{5}\).
\((\frac{26}{60}-\frac{33}{60})\cdot\frac{9}{5}=-\frac{7}{60}\cdot\frac{9}{5}=-\frac{21}{100}\).
\(\frac{25}{17}:(\frac{12}{17}+\frac{29}{11})=\frac{25}{17}:\frac{625}{187}=\frac{11}{25}\).
\(4{,}1\cdot7{,}7+0{,}86=31{,}57+0{,}86=32{,}43\).
\(24\cdot\frac{1}{4}+1=7\).
\(2{,}4\cdot(\frac{3}{7}+\frac{4}{7})=2{,}4\).
\(0{,}000125\cdot2000=0{,}25\).
\(80\cdot0{,}0001-6\cdot(-0{,}001)+0{,}5=0{,}008+0{,}006+0{,}5=0{,}514\).
\(0{,}3+0{,}003+0{,}0002=0{,}3032\).

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