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Đáp án:

$\begin{array}{l}
a)1024:{2^5} + 140:\left( {38 + {2^5}} \right) - {7^{23}}:{7^{21}}\\
 = {2^{10}}:{2^5} + 140:\left( {38 + 32} \right) - {7^2}\\
 = {2^5} + 140:70 - 49\\
 = 32 + 2 - 49\\
 =  - 15\\
b)36.55 - 185.11 + 121.5\\
 = 36.55 - 37.5.11 + 11.11.5\\
 = 36.55 - 37.55 + 11.55\\
 = 55.\left( {36 - 37 + 11} \right)\\
 = 55.10\\
 = 550\\
c)98.42 - 50.\left[ {\left( {18 - {2^3}} \right):2 + {3^2}} \right]\\
 = 98.42 - 50.\left[ {\left( {18 - 8} \right):2 + 9} \right]\\
 = 98.42 - 50.\left( {10:2 + 9} \right)\\
 = 98.3.14 - 50.14\\
 = 14.\left( {98.3 - 50} \right)\\
 = 14.\left( {294 - 50} \right)\\
 = 14.244\\
 = 3416\\
d)407 - \left[ {\left( {190 - 170} \right):4 + 9} \right]:2\\
 = 407 - \left( {20:4 + 9} \right):2\\
 = 407 - \left( {5 + 9} \right):2\\
 = 407 - 14:2\\
 = 407 - 7\\
 = 400\\
e)\left( {23.36 - 17.36} \right):36\\
 = \left( {23 - 17} \right).36:36\\
 = 6\\
f){3.5^2} - 27:{3^2} + {5^2}.4 - 18:{3^2}\\
 = 3.25 - 3 + 25.4 - 18:9\\
 = 75 - 3 + 100 - 2\\
 = 75 - 3 - 2 + 100\\
 = 70 + 100\\
 = 170
\end{array}$