1.а) 2.5х(-4у)(-0.1)=-10х(-0.1)=1
б)(y-2x-1.6)(-3)=-3y+6x+4.8
в)1.2(3b-c+2)=3.6b-1.2c+2.4
2.a)2.1b-3.4a-(b-2.6a)=2.1b-3.4a-b+2.6a=1.1b-0.8a
б)x-(4x-11)+(9-2x)=x-4x+11+9-2x=-5x+20
в)10-9(а-2/3)+5a-16=10-9a+6+5a-16=-4a
3.2(0.3a-1)-2/5(3a-5)=0.6a-2-1 1/5a+2=0.6*1/3-2-(1 1/5*1/3)+2=3/15-6/15=-3/15