2 вычислите  (1. 1/3 - 2. 5/6):(0.75-1. 1/6)
(-1.25+1. 7/8):(-1. 1/12-0/5)
3 решить уровнения
а)2*(0.4х-1.2)=х+1.4
б)х-1. 2/7=4x+2. 5/14
в)3*(0.4x+1.4)=x-0.8
г) 3x+1. 2/9+x-3. 10/27
4 решить пример
4/7*(1.4*-1. 7/8 - 3.5)+1.2*(3-2*-1. 7/8)
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