Выполните действия а)1/2+2/4 : б)3/4+12/16 : в)3/4-5/8 : г)4/15+2/5 : д)2/3-3/5 : е)3/7-3/8 : з)7/8-17/20 : ж)5/12+4/9
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б)3/4+12/16=12/16+12/16=24/16=1,5
в)3/4-5/8=6/8-5/8=1/8=0,125
г)4/15+2/5=4/15+6/15=10/15
д)2/3-3/5=10/15-9/15=1/15
е)3/7-3/8=24/56-21/56=3/56
з)7/8-17/20=140/160-136/160=4/160=0,025
ж)5/12+4/19=95/228+48/228=143/228