Question

Answer 1

a) Ta có: \(-2x^2y^3\cdot\left(3xy^4\right)\)

\(=\left(-2\cdot3\right)\cdot\left(x^2\cdot x\right)\cdot\left(y^3\cdot y^4\right)\)

\(=-6x^3y^7\)

Bậc là 10

b) Ta có: \(-6x^2y\cdot\left(-\dfrac{1}{2}x^3y^2\right)\)

\(=\left(-6\cdot\dfrac{-1}{2}\right)\cdot\left(x^2\cdot x^3\right)\cdot\left(y\cdot y^2\right)\)

\(=3x^5y^3\)

Bậc là 8

c) Ta có: \(5x^2y\cdot\left(-x^3y^2\right)^2\)

\(=5x^2y\cdot x^6y^4\)

\(=5x^8y^5\)

Bậc là 13