Đặt: \(A=3xy^2z^3.\left(-2x^2yz\right)\left(4x^3y^5z^7\right)^2\)
\(A=3xy^2z^3.\left(-2\right)x^2yz4^2x^6y^{10}z^{14}\)
\(=3xy^2z^3\left(-2\right)x^2yz16x^6y^{10}z^{14}\)
\(=\left[3.\left(-2\right).16\right]\left(xx^2x^6\right)\left(y^2yy^{10}\right)\left(z^3zz^{14}\right)\)
\(=-96x^9y^{13}z^{18}\)
→ Bậc: 40
b) Thay x = 1; y = -1 và z = 1 ta có:
\(-96.1^9.\left(-1\right)^{13}.1^{18}\)
\(=-96.1.\left(-1\right).1\)
\(=96\)