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b.5 1/7 x 1 5/9 - 6 : 4 1/2= 8 - 1 2/7= 6 5/7
c.3 1/4 x (2 1/4 - 1 1/2 : 6)= 3 1/4 x ( 2 1/4 - 1/2)= 3 1/4 x 1 3/4= 3 3/4
d. 5 4/9 - 1 1/6
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''' = ?
3 2/3 x (1 1/4 - 1/2)
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