Question

Calcule:
a) (2ab).(+4a) f) (x 2 y 3 ).(5x 3 y 2 )
b) (–5a 2 ).(+5ab 2 ) g (–3x).(+2xy).( –x 3 )
c) (– 5).(+15a 2 b) h) (–x 3 ).(5ax 2 ).(2a 3 )
d) (–9x 2 y).( –5xy 2 ) i) (–ay).( –ay).( –ay)
e) (+3x 2 y).( –xy) j) (–am).(a 2 m).(3m)

Answer 1

Resposta:

Explicação passo-a-passo:

a) (2ab).(+4a) junta as variaveis IGUAIS

(2ab)(4a)

2(4)aab

8a²b

f)

(x 2 y 3 ).(5x 3 y 2 )

(x²y³)(5x³y²)

5x².x³.y³.y²  variaveis IGUAIS  ( soma)

5x⁵.y⁵

b)

(–5a 2 ).(+5ab 2 )

(-5a²)(+5ab²)

(-5)(+5)a².a.b²

(-)(+)5.5a³b²

    - 25a³b²

g

(–3x).(+2xy).( –x 3 )

(-3x)(+2xy)(-x³)  mesmo que

(-3x)(+2xy)(-1x³)

(-3)(+2)(-1)x.x.x³y

(-)(+)(-)3x2x1x⁵y

    -(-)6x⁵y

      + 6x⁵y

c)

(– 5).(+15a 2 b)

(-5)(+15a²b)

(-)(+)5x15a²b

   - 75a²b

h)

(–x 3 ).(5ax 2 ).(2a 3 )

(-x³)(5ax²)(2a³)  mesmo que

(-1x³)(5ax²)(2a³)

(-1)(5)(2)a.a³x³.x²

    - 10a⁴.x⁵

d)

(–9x 2 y).( –5xy 2 )

(-9x²y)(-5xy²)

(-9)(-5)x²x.yy²

(-)(-)9x5x³y³

   + 45x³y³

i)

(–ay).( –ay).( –ay)

(-)(-)(-)aaayyy

  +(-)a³y³

     - a³y³

e)

(+3x 2 y).( –xy) mesmo que

(+3x²y)(-1xy)

(+3)(-1)xx²x.yy

(+)(-)3x1x³y²

    - 3x³y²

j)

(–am).(a 2 m).(3m)

(-1am)(1a²m)(3m)

(-1)(1)(3)aa²mmm

       - 3a³m³