Question by Fake Love - Discuss with MathYouLike

Fake Love

23/11/2017 at 13:59

Làm tính nhân:

a) x²(5x³ – x - $\frac{1}{2}$ );

b) (3xy – x² + y) $\frac{2}{3}$ x²y;

c) (4x³– 5xy + 2x)(- $\frac{1}{2}$ xy).

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Lạnh Lùng Boy 23/11/2017 at 14:01

a) x2(5x3 – x - 1212) = x2. 5x3 + x2 . (-x) + x2 . (-1212)

                           = 5x5 – x3 – 1212x2

b) (3xy – x2 + y) 2323x2y = 2323x2y . 3xy + 2323x2y . (- x2) + 2323x2y . y

                                  = 2x3y2 – 2323x4y + 2323x2y2

c) (4x3– 5xy + 2x)(- 1212xy) = - 1212xy . 4x3 + (- 1212xy) . (-5xy) + (- 1212xy) . 2x

                                      = -2x4y + 5252x2y2 - x2y.
Fake Love selected this answer.

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