4/15-(4/15-2/13) 2/5-2/8+3/5-5/8 3/4+3/8-(1/4-5/8) 7/15+5/12-7/15+7/12 2/5+9/10-11/20 3/4-
4/15-(4/15-2/13)2/5-2/8+3/5-5/83/4+3/8-(1/4-5/8)7/15+5/12-7/15+7/122/5+9/10-11/203/4-...
4/15-(4/15-2/13) 2/5-2/8+3/5-5/8 3/4+3/8-(1/4-5/8) 7/15+5/12-7/15+7/12 2/5+9/10-11/20 3/4-1/2+5/8 11/20-(7/10-1/5)
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4/15-(4/15-2/13)
=4/15-4/15+2/13
=2/13
2/5-2/8+3/5-5/8
=2/5+3/5-(2/8+5/8)
=1-7/8
=1/8
3/4+3/8-(1/4-5/8)
=3/4+3/8-1/4+5/8
=3/4-1/4+(3/8+5/8)
=1/2+1
=1.5
7/15+5/12-7/15+7/12
=7/15-7/15+(5/12+7/12)
=1
2/5+9/10-11/20
=8/20+18/20-11/20
=3/4
3/4-1/2+5/8
=6/8-4/8+5/8
=7/8
11/20-(7/10-1/5)
=11/20-1/2
=1/20
=4/15-4/15+2/13
=2/13
2/5-2/8+3/5-5/8
=2/5+3/5-(2/8+5/8)
=1-7/8
=1/8
3/4+3/8-(1/4-5/8)
=3/4+3/8-1/4+5/8
=3/4-1/4+(3/8+5/8)
=1/2+1
=1.5
7/15+5/12-7/15+7/12
=7/15-7/15+(5/12+7/12)
=1
2/5+9/10-11/20
=8/20+18/20-11/20
=3/4
3/4-1/2+5/8
=6/8-4/8+5/8
=7/8
11/20-(7/10-1/5)
=11/20-1/2
=1/20
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