Respostas

2013-09-12T13:48:50-03:00
A)3xy²-5x²y+2xy²+3x²y=
-2xy²+2xy²+3x²y=
3x²y

b)-3xy²+5xy²-3x²y-x²y+1=
2
xy²-4x²y+1


2 2 2