1) а) -(3x-0.4)+(0.4x-3)=-3x+0.4+0.4x-3=-2.6x-2.6
б) 2+3(y-1/3)-2(0.5+y)=2+3y-1-1-2y=y
в) 5a(a+b)-(3a-b)b+2b(b-a)=5a^2+5ab-3ab+b^2+2b^2-2ab=5a^2+3b^2
г) (3x^2+y)(2y-5x^2)=3x^2y+2y^2-15x^4-5x^2y=2y^2-15x^4-2x^2y
2) а) 7(x+8)+(x-8)(x+8)=7x+56+x^2-64=x^2+7x-8
б) 3(2x-1)^2+12x=3(4x^2-4x+1)+12x=12x^2-12x+3+12x=12x^2+3
в) (x+3)^2-(x-2)(x+2)=x^2+6x+9-x^2+4=6x+13
г) (1-2x)(4x^2+2x-1)+8x^3=4x^2+2x-1-8x^3-4x^2+2x+8x^3=4x-1