a) \(73\cdot142+73\cdot258\)
\(\Rightarrow73\cdot\left(142+258\right)\)
\(\Rightarrow73\cdot400\)
\(\Rightarrow29200\)
b) \(3\cdot3^2-5^6:5^4+\left(2021-2020\right)^{200}\)
\(\Rightarrow3^3-5^2+1^{200}\)
\(\Rightarrow27-25+1\)
\(\Rightarrow3\)
c) \(420:\left[219-\left(17-14\right)^2\right]\)
\(\Rightarrow420:\left[219-3^2\right]\)
\(\Rightarrow420:\left[219-9\right]\)
\(\Rightarrow420:210\)
\(\Rightarrow2\)
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