a) \(\left(3^2\right)^3-\left(-2^3\right)^2-\left(-5^2\right)^2\)
\(=9^3-\left(-8\right)^2-25^2\)
\(=729-64-625\)
\(=665-625\)
\(=40.\)
b) \(\left(-1+3\frac{2}{5}+\frac{1}{4}\right).\left(-4\right)\)
\(=\left(-1+\frac{17}{5}+\frac{1}{4}\right).\left(-4\right)\)
\(=\frac{53}{20}.\left(-4\right)\)
\(=-\frac{53}{5}.\)
Chúc bạn học tốt!