A = 1/2 - (1/4 +1/5)
A = 1/2 -( 5/20 +4/20)
A = 1/2 - ( 9/20)
A = 1/2 -9/20 = 10/20 -9/20 = 1/20
B = (3 +1/4) + (5 -6/7)
B= (12/4 + 1/4) + ( 35/7 -6/7)
B = 13/4 + 29/7 = 91/28 + 116/28 = 207/28
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A = 1/2 - (1/4 +1/5)
A = 1/2 -( 5/20 +4/20)
A = 1/2 - ( 9/20)
A = 1/2 -9/20 = 10/20 -9/20 = 1/20
B = (3 +1/4) + (5 -6/7)
B= (12/4 + 1/4) + ( 35/7 -6/7)
B = 13/4 + 29/7 = 91/28 + 116/28 = 207/28