a) \(\left(2^{17}+15^4\right)\cdot\left(3^{19}-2^{17}\right)\cdot\left(2^4-4^2\right)\)
\(=\left(2^{17}+15^4\right)\cdot\left(3^{19}-2^{17}\right)\cdot\left(2^4-2^4\right)\)
\(=\left(2^{17}+15^4\right)\cdot\left(3^{19}-2^{17}\right)\cdot0\)
\(=0\)
b) \(100 + 98 + 96 +...+4 + 2 - 97 - 95 - 93 -...- 3 - 1\)
\(= 100 + (98 - 97) + (96 - 95) +...+ (4 - 3) + (2 - 1) \)
\(= 100 + 1 + 1 +...+ 1 + 1\) (98 : 2 = 49 số 1)
\(= 100 + 49 = 149\)
