Question

A

B

C

D

Answer 1

Ta có: \(7x^2y^7\cdot\left(-3\right)\cdot x^3y\cdot\left(-2\right)\)

\(=\left[7\cdot\left(-3\right)\cdot\left(-2\right)\right]\cdot\left(x^2\cdot x^3\right)\cdot\left(y^7\cdot y\right)\)

\(=42x^5y^8\)

Vậy: Chọn C