Question by Fake Love - Discuss with MathYouLike

Fake Love

23/11/2017 at 15:11

Làm tính nhân:

a) $5 x^{2} . (3 x^{2} - 7 x + 2);$

b) $\frac{2}{3} x y . (2 x^{2} y - 3 x y + y^{2})$

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Lạnh Lùng Boy 23/11/2017 at 15:15

a) $5 x^{2} . (3 x^{2} - 7 x + 2)$

$= 5 x^{2} .3 x^{2} - 5 x^{2} .7 x + 5 x^{2} .2$

$= 15 x^{4} - 35 x^{3} + 10 x^{2}$

b) $\frac{2}{3} x y . (2 x^{2} y - 3 x y + y^{2})$

$= \frac{2}{3} x y .2 x^{2} y - \frac{2}{3} x y .3 x y + \frac{2}{3} x y . y^{2}$

$= \frac{4}{3} x^{3} y^{2} - 2 x^{2} y^{2} + \frac{2}{3} x y^{3}$
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