Question

Calcule as multiplicaçoes dos monômios
(+5x) . (-4x²)
(-2x) . (+3x)
(+5x) . (+4x)
(-9x²y) . (-5xy²)
(+3x²y) . (-xy)
(X²y³) . (5x³y²)
(-3x) . (+2xy) . (-x³)
(-x³) . (5yx²) . (2y³)
(-xy) . (-xy) . (-xy)
(-xm) . (X²m) . (3m
(-3xy) . (-2x)

Answer 1

a) (+5x) . (-4x²) = -20x³ 
b) (-2x) . (+3x) = -6x²
c) (+5x) . (+4x) = 20x²
d) (-9x²y) . (-5xy²) = 45x³y³
e) (+3x²y) . (-xy) = -3x³y²
f) (x²y³) . (5x³y²) = 5x⁵y⁵
g) (-3x) . (+2xy) . (-x³) = 6x⁵y
h) (-x³) . (5yx²) . (2y³) = -10x⁵y⁴
i) (-xy) . (-xy) . (-xy) = -x³y³
j) (-xm) . (x²m) . (3m) = -x³m³
k (-3xy) . (-2x) = 6x²y