Respostas

2014-04-13T16:46:16-03:00
A)0,8+1/4-2/5+1,45=
1,05-2/5+1,45=
0,65+1,45=
2,1

b)(1/2.3/4)+2/5=
0,375+2/5=
0,775

c)2.3/4+1/2-2+1/3:2+2/5=
1,5+1/2-2+1/3:2+2/5=
2-2+1/3:2+2/5=
1/3:2+2/5=
0,166+2/5=
0,5666.....

d)1,3+4,6-(2/3.1/2)=
1,3+4,6-0,3333...
5,9-0,333333......
5,56