Question

1) efetue a) (-a^3) . ( a^5)=
b) (4xy/3) . (- xy^2/2) . ( 8x/5)=
c) (-3 a^2 c) . ( 2ac ) . (-c)=
d) ( -3b/4) . ( 8b^2/9)=
me ajudeem aí

Answer 1

a. (-a^3).( a^5)
    (-a^3)a^5
    -a^3a^5  (somando os expoentes)
    -a^8

b.(4xy/3).(-xy^2/2).(8x/5)
   4xy/3.-xy^2/2.8x/5
   - 2xy/3.xy^2.8x/5
   -16x^3y^3/15

c.(-3a^2c).(2ac).(-c)
   (-6a^2c).(2ac).(-c)
   12a^3c^3

d. (-3b/4).(8b^2/9)
    -3b/4.8b^2/9
    -b.2b^2/3
    - 2b^3/3