(4 1/2-2 2/5)-(6 3/5-5 2/3) = (9/2-12/5)·(33/5-17/3) = (45/10-24/10)·(99/15-85/15) =
21/10·14/15 = 147/75 = 1 72/75 = 1 24/25
3 1/4+2 2/5-(4 1/3-2 2/3) = 13/4+12/5-(13/3-8/3) = 13/4+12/5-5/3 =
195/60+144/60-100/60 = 339/60-100/60 = 239/60 = 3 59/60
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(4 1/2-2 2/5)-(6 3/5-5 2/3) = (9/2-12/5)·(33/5-17/3) = (45/10-24/10)·(99/15-85/15) =
21/10·14/15 = 147/75 = 1 72/75 = 1 24/25
3 1/4+2 2/5-(4 1/3-2 2/3) = 13/4+12/5-(13/3-8/3) = 13/4+12/5-5/3 =
195/60+144/60-100/60 = 339/60-100/60 = 239/60 = 3 59/60