Resolva:
a) 2/3 + 1/4=
b) 3/5 + 4/3=
c) 6/5 + 2/7=
d) 4/5 + 3/10=
e) 5/6 + 2/3=
f) 9/4 + 3/5=
g) 4/5 - 1/3=
h) 2/3 - 1/5=
i) 5/2 - 2/3=
j) 6/4 - 5/9=
k) 5/2 - 1/3=
l) 8/3 - 1/2=
m) 5/4 - 3/5=
n) 6/5 - 2/3=
quinta-feira, 20 de agosto de 2009
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