Respostas

2014-03-20T14:48:24-03:00
A)2/(-1)=-2
b)2/(2/3)=3.2/2=3
c)2/0,2=1/0,1=10
d)2/(x+h)
e)2/(x+h)-2/(x)
multiplicando as frações pelos seus denominadores
=2x/(x²+xh)-(2x+2h)/(x²+xh)
=-2h/(x²+xh)
f)(2/(x+h)-2/(x))/x = 2/x(x+h)-2/x²=
=x²2/x²(x²+xh)-2(x²+xh)/x²(x²+xh)=
=(2x²-2x²+2xh)/x²(x²+xh)=
=2xh/(x⁴+x³h)
simplificando
=2h/(x³+x²h)
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