1) 3/5+1/4=(12+5)/20=17/20
2) 17:17/20=20
3) 7/8-1/4=7/8-2/8=5/8
3) 5/8*(4/5*4/5)=5/8*16/25=2/5
4) 20+2/5=20.4
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Answers & Comments
1) 3/5+1/4=(12+5)/20=17/20
2) 17:17/20=20
3) 7/8-1/4=7/8-2/8=5/8
3) 5/8*(4/5*4/5)=5/8*16/25=2/5
4) 20+2/5=20.4