Respostas

2014-07-31T13:34:02-03:00

-202y+200y= -2y

-56d+76d +3d+20d=43d

1001x-2x+75x+23x-1001x+2x-75x= 23x

28b-56b+2b-28b+56b=2x

ou com o nemos no 2b

A melhor resposta!
2014-07-31T14:15:01-03:00
(-200-1-1+200)y= -2y
(-56+76+3+20)d= 43d
(1001-2+75+23-1001+2-75)x= +23x
(28-56+2-28+56)b= +2b
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