是x^4+2x^2(1-x)+(1-x)^2=x^4-2x^3+3x^2-2x+1
(x∧2-x+1)∧2等于多少?=x∧4+x∧2+1-2x∧3+2x∧2-2x
(x^2-x+1)^2 =x^4+x^2+1-2x^3+2x^2-2x =x^4-2x^3+3x^2-2x+1.