Question

1)Desenvolva (com as contas pfv )
a)(x+y) ³

B)(x-y)³

C)(m+3)³

D)(a-1)³

E)(5-x)³

Answer 1

a) usando (a+b)=a³+3a²b+3ab+b³;temos:
= x³+3x²y+3xy²+y³

b)mesmo processo:
=x³-3x²y=3xy²-y³

c)(m+3)²
=m²+2m x 3+3²
=m²+6m+9

d)(a-1)³
=a³-3a² x 1+3a x 1²-1³
=a³-3a²+3a x 1-1
=a³-3a²+3a -1

e)(5-x)3
=125-75x+15x²-x³
=-x³=15x²-x²