Question

1) Calcule a) 7x . (2x-5 )
b) (3a^2 - 2a - 1). 5a
c) - 3x (4x^2 - 3x + 1)
d) 2/5 a .(a-1/4)
e) (0,3x^2 - 1,4x) . (-0,2x^3)
f) (1/3y^2 + 4/7y^3) . (-3y)​

Answer 1

Resposta:

A

$7x.(2x-5)\\14x^2 - 35x$

B

$(3a^2 - 2a -1).5a\\15a^3 - 10a^2 - 5a$

C

$-3x(4x^2-3x +1)\\-12x^3 + 9x^2 -3$

D

$\frac{2}{5}a .(a-\frac{1}{4})\\\frac{2}{5}a^2 - \frac{2}{20}a$

E

$(0,3x^2 -1,4x).(-0,2x^3)\\0,06x^5 + 0,28^4$

F

$(\frac{1}{3}y^2 + \frac{4}{7}y^3).(-3y)\\-\frac{3}{3}y^3 - \frac{12}{7}y^4$

Explicação passo a passo:

espero que ajude