1/4 + 2/3 - 8/11
= 1/4 + 22/33 - 24/33
= 1/4 - 2/33
= 33/132 - 8/132
= 25/132
3/10 + 1/4 + 7/10
= 0.3 + 0.7 + 0.25
= 1.25
5/6 - ( 3/4 - 1/6 )
= 5/6 + 1/6 - 3/4
= 1 - 3/4
= 1/4
4/11 + 5/6 + 1/11 + 1/6
= ( 5/6 + 1/6 ) + ( 4/11 + 1/11 )
= 1 + 5/11
1 - 3/4 - 1/4
= 1 - ( 3/4 + 1/4 )
= 1 - 1
= 0
8/9 + 5/17 + 10/9 + 12/17
= ( 8/9 + 10/9 ) + ( 5/17 + 12/17 )
= 18/9 + 17/17
= 2 + 1
= 3
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