6/8 - 2/10
( 6/8 ÷ 2/2 ) - ( 2/10 ÷ 2/2 )
3/4 - 1/5
3×5/4×5 - 1×4/5×4
15/20 - 4/20
15-4/20
11/20
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6/8 - 2/10
( 6/8 ÷ 2/2 ) - ( 2/10 ÷ 2/2 )
3/4 - 1/5
3×5/4×5 - 1×4/5×4
15/20 - 4/20
15-4/20
11/20