Question

[Thinh Lê]

Thu gọn các đơn thức sau:

a) \(\frac{1}{2}\)x²(-2x²y²z)³

b) \(\frac{1}{4}\)x²(-2³y⁵)

Answer 1

[Trúc Giang]

a) \(\frac{1}{2}x^2\left(-2x^2y^2z\right)^3\)

\(=\frac{1}{2}x^2\left(-8x^5y^5z^3\right)\)

\(=\left[\frac{1}{2}.\left(-8\right)\right]\left(x^2.x^5\right).y^5z^3\)

\(=\left(-4\right)x^7y^5z^3\)

b) \(\frac{1}{4}x^2\left(-2^3y^5\right)\)

\(=\frac{1}{4}x^2\left(-8y^5\right)\)

\(=\left[\frac{1}{4}.\left(-8\right)\right]x^2y^5\)

\(=\left(-2\right)x^2y^5\)

P/s: Không chắc!