Respostas

2013-11-21T10:41:55-02:00
P= soma dos lados
p=2a+2b
p=2(5x+3) + 2(2x-1)
p=10x+6+4x-2
p=14x+4

letra b

A = bxh
A= (x+4)x(x+3)
A= x^2+3x+4x+12
A= x^2+7x+12

letra d.
2013-11-21T11:08:11-02:00
A) P = 2.(2x-1+5x+3)
P = 2.(7x+2)
P = 14x+4

b) A = (x+4).(x+3)
A = x²+3x+4x+12
A = x²+7x+12