quinta-feira, 20 de agosto de 2009

Matemática 5ª série

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=

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