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b)1 1/2 ² - 1 3/5 : 2 2/3 = 3/2 * 3/2 - 8/5 =9/4 - 8/5= 45/20 -32/20=13/20
c) 3 1/4 : [(2 5/8 - 1 1/6 ) : 2 1/2 ] = 4/13 * [(21/8 - 7/6) * 1/5 ]=4/13 * [(21/24 - 7/24)* 1/5 ]= 4/13 * ( 14 * 1/5 )= 4/13 * 14/5 = 56/65