(1)1-6x+9x^2(2)y^2-1/2xy+1/16x^2(3)(x^2-2x)^2-2x(2-x)+1(4)(a+2b)^2-10(a+2b)+25
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(1)1-6x+9x^2(2)y^2-1/2xy+1/16x^2(3)(x^2-2x)^2-2x(2-x)+1(4)(a+2b)^2-10(a+2b)+25
(1)1-6x+9x^2
(2)y^2-1/2xy+1/16x^2
(3)(x^2-2x)^2-2x(2-x)+1
(4)(a+2b)^2-10(a+2b)+25
(1)1-6x+9x^2(2)y^2-1/2xy+1/16x^2(3)(x^2-2x)^2-2x(2-x)+1(4)(a+2b)^2-10(a+2b)+25
(1)1-6x+9x^2 =(1-3x)^2
(2)y^2-1/2xy+1/16x^2 =(y-1/4 x)^2
(3)(x^2-2x)^2-2x(2-x)+1 =(x^2-2x-1)^2
(4)(a+2b)^2-10(a+2b)+25=(a+2b-5)^2