efetue as multiplicações indicadas usando a técnica do cancelamento quando possível 
  1/3 X 4/7
7/8 X 3/2
3/5 X 5/9
2/7 X 11/2
9/8 X 4/45
4/45 X 9/8
45/4 x 8/9
8/9 X 45/4
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