Question

2. Calcule:
a) (2 a b ) . (+ 4 a ) = ………………………
b) ( - 5 a² ) . ( + 5 a b² ) = ………………………
c) ( - 5 ) . ( + 15 ab² ) = ………………………..
d) ( - 9 x²y) . ( - 5x y²) = ………………………
e) ( + 3 x² y ) . ( - x y )= …………………………
f) (x² y ³ ) . ( 5 x³ y²) = ……………………….
g) ( - 3 x ) . ( + 2 xy ) . ( - x³ ) = …………………………..​

Answer 1

Resposta e explicação:

Estou usando o método de chuveirinho.

$a) (2ab) . (+ 4a) =8a^2b\\\\b) ( - 5a^2) . (+ 5ab^2) = - 25 a^3b^2\\\\c) ( -5) . (+ 15ab^2) = - 75 ab^2$

$d) ( -9x^2y) . ( -5xy^2) = 45x^3y^3\\\\e) (+3x^2y) . (-xy)= -3x^3y^2\\\\f) (x^2y^3) . (5x^3y^2) = 5x^5y^5$

$g) (-3x) . (+2xy) . (-x^3) = (-6x^2y).(-x^3) = 6x^5y$

Espero ter ajudado :)