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2014-10-02T20:54:14+03:00
A.1,2(5)=125-12/90=113/90
0,1(4)=14-1/90=13/90
1,1(5)=115-11/90=104/90 
1,8(4)=184-18/90=166/90
[-1.2(5)+0.1(4)]x[12-1.1(5)-1.8(4)]=
(113/90+13/90)
·(12-104/90-166/90)=126/90·(12-270/90)=simplif=7/5·(12-3)=7/5·9=63/5=12,6