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2013-03-26T16:25:50+01:00

5/4 - 11/4 x 20/33

= 5/4 x-220/132

= 165/132 -200 /132 = -35/132

 

5/2 : 7/4 +9/2

= 5/2 : 7/4 +18/4

= 5/2 : 25/4

= 5/2 x 5/25

= 25/50

= 1/2