1)1,2а-а=1,2а-1а=(1,2-1)а=0,2а
2)b-2,1b=1b-2,1b=(1-2,1)b=-1,1b
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1)1,2а-а=1,2а-1а=(1,2-1)а=0,2а
2)b-2,1b=1b-2,1b=(1-2,1)b=-1,1b