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а)31/80 + (3/16 + 39/80) б)2/45 + (3/45 + 7/9) в)(3/7 + 5/14) + 1/14.
а)31/80 + (3/16 + 39/80) б)2/45 + (3/45 + 7/9) в)(3/7 + 5/14) + 1/14.
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A) 31/80 +(3/16 + 39/80)= (31/80+39/80)+3/16=70/80+3/16=14/16+3/16=17/16=1 1/16б) 2/45+(3/45+7/9)=(2/45+3/45)+7/9=5/45+7/9=1/9+7/9=8/9
в) (3/7+ 5/14)+1/14=3/7+(5/14+1/14)=3/7+6/14=3/7+3/7=6/7