问题标题:
【数学题求高手``最次高中水平进`十字相乘法:(ax+b)(cx+d)=2(x方)+3x+1=6(x方)+x-1=x*x*x-2x-1=A方+B方=(x立方)-3x+2=(x+1)(x+2)(x+3)(x+4)+x=】
问题描述:
数学题求高手``最次高中水平进`
十字相乘法:(ax+b)(cx+d)=
2(x方)+3x+1=6(x方)+x-1=
x*x*x-2x-1=
A方+B方=
(x立方)-3x+2=
(x+1)(x+2)(x+3)(x+4)+x=
程道生回答:
(ax+b)(cx+d)=ac(x方)+(ad+bc)x+bd
2(x方)+3x+1=(2x+1)(x+1)
6(x方)+x-1=(3x-1)(2x+1)
x*x*x-2x-1=?
A方+B方=(a+b)方-2ab
(x立方)-3x+2=?
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