Question

multiplique os monomios

a) 2X.3XY=

b) 10ab².5ab²

c) (-2X³) . (-3XY) =

d) 5a²b . (-2absobre a 5)

Answer 1

$2x \times 3xy = 2 \times 3 \times x \times x \times y = (2 \times 3) \times (x \times x) \times y = 6 {x}^{2} y \\ 10ab {}^{2} \times 5ab {}^{2} =( 10 \times 5) \times (a \times a )\times (b {}^{2} \times b {}^{2} )= 50a {}^{2} b {}^{4} \\ ( - 2x {}^{3} ) \times ( - 3xy) = ( - 2) \times ( - 3) \times (x {}^{3} \times x) \times y = 6 x{}^{4}y \\ 5 {a}^{2} b \times ( \frac{ - 2ab}{5} ) = \frac{- 10 {a}^{3} {b}^{2}}{5 {a}^{2} b} = - 2ab$