(6x-1)(2x-1)(3x+1)(x-1)+x2
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(6x-1)(2x-1)(3x+1)(x-1)+x2
(6x-1)(2x-1)(3x+1)(x-1)+x2
(6x-1)(2x-1)(3x+1)(x-1)+x2
展开得:36 X^4 - 48 X^3 + 8 X^2 + 6 X - 1
简便验算系数:
将X=1代入原式:5*1*4*0+1=1;
代入展开式:36-48+8+6-1=1;两者相等,故不拒绝展开式.
如果实在不放心,请自己代入其他数字验算即可.
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