疑难数学问题火急求助x1^3-3x1^2+2x1+x2→x1(x1^2-2x1+2-x1)+x2→x1(3-x1)+x2
2个回答
x1^2-2x1+2-x1
=x1^2-3x1+2
=(x1-1)(x1-2)
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