Question

{ 3a²x² . [ ax (4a - 5x) +7ax ] + a²x³ [ 15(a + x) -21 ]} : 9a³x³

Answer 1

\(\dfrac{3a^2x^2\left[ax\left(4a-5x\right)+7ax\right]+a^2x^3\left[15\left(a+x\right)-21\right]}{9a^3x^3}\)

\(=\dfrac{3a^2x^2\left(4a^2x-5ax^2+7ax\right)+a^2x^3\left(15a+15x-21\right)}{9a^3x^3}\)

\(=\dfrac{a^2x^2\left[3\left(4a^2x-5ax^2+7ax\right)+15a+15x-21\right]}{9a^3x^3}\)

\(=\dfrac{3\left(4a^2x-5ax^2+7ax\right)+3\left(5a+5a-7\right)}{9ax}\)

\(=\dfrac{4a^2x-5ax^2+7ax+5a+5x-7}{3ax}\)

Chúc bạn học tốt!!!