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b)-¼+½ ½
-------= ----= 1
-¼+½ ½
c) 9 - 4*(2*½)=9-4=5
d) (4-1)(4-2)(4-3)(4-4)(4-5)(4-6)(4-7)= 3*2*1*0*-1*-2*-3= -36