а) -0.85a+0.7b-2.1a+1a-o.65b= (-0.85-2.1+1)a+(0.7-0.65)b= -1.95a+0.05b
б) 2x - 1/2y-4/5x+2.1y= (2-4/5)x+(-1/2+2.1)y= 1.2x +1.6y
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а) -0.85a+0.7b-2.1a+1a-o.65b= (-0.85-2.1+1)a+(0.7-0.65)b= -1.95a+0.05b
б) 2x - 1/2y-4/5x+2.1y= (2-4/5)x+(-1/2+2.1)y= 1.2x +1.6y