Question

6) (4x+1/4)^3

7) (3x+2/x)^3

8) (x^2+1/x)^3

9) (x+2/xy)^3

10) (x^2+2/xy)^3

Answer 1

\(\left(4x+\frac{1}{4}\right)^3=64x^3+12x^2+\frac{3x}{4}+\frac{1}{64}\)

\(\left(3x+\frac{2}{x}\right)^3=27x^3+54x+\frac{36}{x}+\frac{8}{x^3}\)

\(\left(x^2+\frac{1}{x}\right)^3=x^6+3x^3+2+\frac{1}{x^3}\)

Tương tự ... 

Answer 2

6) \(\left(4x+\frac{1}{4}\right)^3=64x^3+12x^2+\frac{3}{4}x+\frac{1}{64}\)

7) \(\left(3x+\frac{2}{x}\right)^3=27x^3+54x+\frac{36}{x}+\frac{8}{x^3}\)

8) \(\left(x^2+\frac{1}{x}\right)^3=x^6+3x^3+3+\frac{1}{x^3}\)

9) \(\left(x+\frac{2}{xy}\right)^3=x^3+\frac{6x}{y}+\frac{12}{xy^2}+\frac{8}{x^3y^3}\)

10) \(\left(x^2+\frac{2}{xy}\right)^3=x^6+\frac{6x^3}{y}+\frac{12}{y^2}+\frac{8}{x^3y^3}\)