Respostas

2014-05-01T20:18:56-03:00
A) x2-2x/x= 4(2)-2(4):4= 8-8:4= 8-2= 6
B) 3(x2-y2)-10.(x+3).(x-y)= 3 [-2(2)-2(2)]-10.(-2+3).[-2-(2)]= 3 [-4-4]-10.(1).(0)= 3(-8)-10= -24-10= -34
2014-05-02T02:36:08-03:00
A) 4^2 - 2*4/4
=16-8/ 4
=8/4
= 2

B) 3.[(-2^2)-(2^2)] -10.( -2+3).(-2-2)
= 3.(4-4) -10.(1).(-4)
= 3.(0)+ 40
=0+ 40
=40