а 3/4+1/5=19/20 б 19/20*5/19=1/4
а 12 1/3-7 3/4=37/3-31/4=148/12-93/12=55/12 б 55/12*6/11=5/2=2 1/2
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а 3/4+1/5=19/20 б 19/20*5/19=1/4
а 12 1/3-7 3/4=37/3-31/4=148/12-93/12=55/12 б 55/12*6/11=5/2=2 1/2