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2,6: 0,1 : (1/12+3 2/12)=
26 : 3 2/12=
26: 39/12=
26 * 12/29 = 24/3 = 8
( 1 1/4 -0,8 : 4/5) * ( 1 - 0,01 * 20)=
(1 1/4 - 1) * (1-2)=
1/4 * (-1) = -1/4