Respostas

2014-03-10T10:31:49-03:00
4/7+5/7=9/7. 3/2+6/5=27/10. 7/4+7/6= 35/12. 2/5+1/8-3/4=-9/40. 3/5+5/6-1/4=81/60. 1/3+7/9-5/6=5/18
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