(x-3)(x-1)怎么算
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(x-3)(x-1)怎么算(x-3)(x-1)怎么算(x-3)(x-1)怎么算x^2-4x+3就这样？？？？先设等于0？？？x*x-4*x+3(x-3)(x-1)=x^2-x-3x+3=x^2-4x+
(x-3)(x-1)怎么算
(x-3)(x-1)怎么算
(x-3)(x-1)怎么算
x^2-4x+3
就这样？？？？先设等于0？？？
x*x-4*x+3
(x-3)(x-1)
=x^2-x-3x+3
=x^2-4x+3
x^2—4x+3
就是=x2-x-3x+3
=x2-4x+3 ,x2为x的平方
原式＝x×（x－1）＋（－3）×（x－1）＝x＾2－x－3x＋3＝x＾2－4x＋3
(x-3)(x-1)=x*(x-1)-3*(x-1)=x2-x-3x+3=x2-4x+3
(x-3)(x-1)=x2-x-3x+3=x2-4x+3
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