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( 26/7 -65/27) :(25/7-5/2) = ( 702/189 - 455/189) : ( 50/14 - 35/14) = 247/ 189 : 15/14 = 247/189 razy 14/15 = 3458 / 2835
=(3*135/189-2*77/189):(3*8/14-2*7/14)=
=1*58/189:1*1/14=
=247/189*14/15=
=3458/1835=1,884