4)3/4+4/5+1/20=15/20+16/20+1/20=32/20=1 12/20
5)4/3+5/12-1/9=48/36+15/36-4/36=59/36=1 23/36
6)4/15+2/5+7/10=8/30+12/30+21/30=41/30=1 11/30
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4)3/4+4/5+1/20=15/20+16/20+1/20=32/20=1 12/20
5)4/3+5/12-1/9=48/36+15/36-4/36=59/36=1 23/36
6)4/15+2/5+7/10=8/30+12/30+21/30=41/30=1 11/30