А),1.2X-2.5Y=4 -1,4X+1,5Y=1

Б),3.5A+2,4b = 5.8
0,5A+3,2B=-0,6

в), 0.4m-0,9n=-0,1
0,6m-0,3n=0,2

г). 1,2x+1,5y=0,1
1,5x-0,5y=-1,3
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